JJ will become a supervillain.His only power is superhuman intelligence, and he's in a story about people with other superpowers. Most superpowered characters that fit that description are villains.
JJ will become a supersleuthHe will make Sherlock Holmes-style deductions about everyone and everything around him. It'd be even more amusing if he was doing it unconsciously, making connections and drawing conclusions without ever really consciously thinking about them.
Daphne will become a supervillain.
Jim will use his talents as a police sketch artist to try to write a comic book about his family's adventures.He'll probably change names and tweak events to protect his families identities. This will either backfire spectacularly or turn the Powells into celebrities. Or both.
The island they crashed on was The Island.The show is taking Lost's time slot. Come on. How much more obvious could this possibly be?
Everybody has all the same powersBecause, seriously, catching bullets requires Super Speed.
The green sparkles in the water are the pollen of Stephanie's research flower.
Possible case of promoted fanboys or something similar
The Amazon trip and plane crash were planned.We know that Stephanie's boss is up to no good, and that originally their vacation was a research trip for her. He pulled a Batman Gambit and knew Jim would get the whole family to go, hired the pilot to crash into the lake (Never Found the Body) and now has four great new guinea pigs.
The powers are activated by a traumatic experience.In the show's universe, some people are born with natural abilities (like mutants), but they don't activate until the person experiences severe trauma (like a plane crash). The powers adapt to what would aid the person the most. It's very likely that the teleporter and Watcher activated their powers in a heist gone bad.
Powers are both hereditary and sexually transmitted in this universe.Stephanie's parents have a superpower that allows them to be enormous Jerkasses to people and somehow get away with it. Frankly, I can't think of any other reason they weren't kicked out of the house by the end of that pool game.
Watcher is a Well-Intentioned Extremist who wants to look out for the safety of powered people.He just happens to be siding with Stephanie's boss for the moment to keep track of things (research, etc). But ultimately, he wants to protect 'his' people by keeping them a secret... and this means killing people who are a threat to this. There's no reason for him not to kill George (plot armor not withstanding) except that George also feels that these things should be a secret.
Watcher wants to know how to get powers permanently.We know now that he's not innately powered and that King has various test subjects with powers. Thus he's protecting (more or less) Jim at the moment because he's curious about how Jim, someone he knows is not one of the subjects, has powers.
Autumn Reeser's pregnancy will mean that Katie and Watcher will have a baby... with powers (maybe).Barring Katie suddenly sleeping with other people (unlikely at this point though perhaps as a result of a reveal of Watcher's crimes) or artificial insemination (unlikely since there's not really any plot reason to do so just yet), Katie will have gotten pregnant with Watcher's baby. Between Katie and the baby, Watcher will be really hard pressed to be a bad guy any more... unless the pregnancy ends up being miscarried in which case, Watcher will become an anti-hero. Or maybe he just dies trying to protect them in a Redemption Equals Death sort of deal. Either way, either he dies or gets imprisoned in some fashion (likely given how the show doesn't reward bad deeds in any way) or he becomes a Hannibal or Token Evil Teammate. Possibly, he willingly lets himself be imprisoned but breaks on occasionally to help out when they need a Swiss Army Knife of powers.
Victoria Morrow will have a brother named Tom.Because really... the Incredibly Lame Pun would be really hard to resist for a show like this.
Katie and Stephanie will develop a treatment based off the serum in pill form that must be tailored to the individual. Watcher will get this and become an Hourman analogy; a normal guy who pops some pills and gets powers for a certain amount of time.Thus if Watcher stays around for a while as a good guy (and being the mother of all Karma Houdini's), part of his storylines would involve getting a chance to eat his pills and/or not overdosing on pills if he has to extend the length of time he has powers. And of course, it'd be a way to handwave him not having his organs shut down.
Dr. King has superpowers.This one seems to have all the foreshadowing leading up to it. It's the only reason I can think of that the Watcher doesn't just kill him and fake his death to look like suicide, and would also explain why Dr. King, when the Watcher threatened him with force, said that "We both know it isn't that simple". Besides, I know very few power-hungry superpower brokers who have the option of having powers (it wouldn't be hard for Dr. King to give himself the Super Serum he gives to his other employees) who don't have any themselves, or at least don't carry around a vial or syringe of it with them at all times. My guess is that if Dr. King doesn't have powers, he'll go One-Winged Angel when he gets them.
Daphne learned the mind control trick from Watcher when they touched before he wiped her memory.
Dr. King works for The CompanyWatcher has alluded that Dr. King is not at the head of the Super-Human Conspiracy. The parallels between Global Tech and The Company are uncanny- secret organizations developed to study the emergence of superpowers in human beings. Dr. King is clearly the one in charge of the branch that develops the Super Serum seen in Volume 3 of Heroes, and somewhere on the same level of authority as Thompson and above Noah Bennet.
George has powers now.Obviously the Big Bad put him on the plane to die, but it backfired; he inhaled enough vaporized Trisellum to set him up, though his might be lame, since he got less.
George's PowersIt's all but confirmed that George has powers now, but we don't know what, precisely. Post theories here.
Powers really are personality based (on self but also on others around you) with the underlying power actually just a sort of universal energy source.King manifested Jim's and Steph's powers because he was pre-occupied with the two of them (along with staying alive). The Powells themselves have been covered elsewhere. Victoria really wants to fit in and have people like her (shapeshifting). Joshua wants to serve and protect his family so he gets a bunch of stuff that makes his father happy. This would also explain the baby's powers as well as Daphne's mind reading. Daphne 'learned' the power from Joshua while the baby picked up on Joshua's and Katie's desire for it to stay alive (pre and post birth) while learning about healing and telekinesis from Dr. King and Joshua respectively; the reason it was able to activate the powers to begin with are revealed in the finale. The extreme life or death situation in both instances caused the baby's powers to kick in.
Trillsettum powers have the potential to change with every injection.Dr. King gained a healing personality power because the Trillsettum was only supposed to keep him alive. Every time he gave himself an injection the power was being reset, but it was always the same because he was in the same mindset. However, when he injects himself in the finale he's in a very different mindset, that of wanting to destroy Jim. Therefore he was able to gain additional powers that acted as counters to the Powells'.
Victoria will make a Heel-Face Turn
This show was cut so short because of the events of Revolution.Think about it. When a worldwide blackout happens, one of many objects that gets rendered useless is the television. When the TV becomes useless, every single TV show you have ever known will come to an abrupt end.