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The man in the wheelchair is Niles Caulder
John Wesley Shipp is Jay GarrickIt's only obvious that the previous Flash actor would be cast as the Golden Age Flash (though he doesn't have to be a speedster in this 'verse).
Digger Harkness (Captain Boomerang) will appearAs Boomerang is a perennial member of the Suicide Squad, it's clear he'll get a role eventually.
The bolt of lightning wasn't lightning at allIt was a manifestation of the Speed Force. Hence why Oliver said that it "chose" Barry.
The show will keep the New 52 power set of The RougesWe already have shots of the weather wizard having genetic powers rather than a magic stick. It's more than likely they'll keep some more of those genetic powers in the show from the particle accelerator explosion. I can already see them keeping Captain Cold having freeze powers rather than a zero temperature gun as there's a comic prescedence for that.
Season 1 PlotsGuesses here for story lines in the new show.
There will be a Running Gag in which Apple devices don't work for Barry.Because Apple doesn't support Flash.
The explosion of the particle accelerator was not an accident.It was Professor Zoom traveling back in time to manipulate events so that he gets powers.
Flash is especially vulnerable to certain diseases and poisons.His powers speed up his body's physical healing but also speeds up the spread of viruses or poisons in his body.
Captain Cold and Golden Glider will be introduced as a Brother-Sister Team.Ties in with the idea that Captain Cold will be a meta, so will Golden Glider.
The color change in Flash's costume will be lampshadedHe'll still get his nickname of the "scarlet speedster", only for Flash to point out "technically, it's more of a maroon". It'll still stick.
There will be a Smallville tribute episode in which Barry Allen will meet Clark KentIn Smallville, the reverse happened, with a young Superman meeting an even younger Flash. It would be poetic for them to do a parallel episode, with an older Flash meeting a new-to-the-job Superman, who is covering a news report on metahuman crime for a newspaper in Metropolis. One of them will probably lampshade this with something like "Haven't we met before in the past or something?".
The particle accelerator's creation of metahumans around Central City will be similar to the "Big Bang"The usage of the word "metahuman", coupled by the fact that the particle accelerator explosion looks to be the source of where the show's enemies will come from, shows clear resemblances to the series. To add to this, one of Barry's scientific allies could be none other than Virgil Hawkins, and some of the metahuman rogues he faces may be from Static's rogues gallery (Hey, if they give Batman rogues to Arrow, then why not?).
At least, the future Justice League film will use Gustin and Amell as alternate universe versions of their charactersWith new costumes.
...But there will be a Multiverse episode or story arc down the linePerhaps including every live-action DC thing legally possible to include. The Flash being the one to discover it would be a natural Mythology Gag to "Flash of Two Worlds".
Eddie Thawne is from the FutureHe is Professor Zoom and hates Barry, and traveled back in time to ruin his life, first by killing his mother and then by stealing his wife
Harrison Wells is Professor ZoomEddie Thawne is a Red Herring, and Wells is the actual villain
Eddie Thawne is an ancestor of Eobard ThawneEddie isn't Professor Zoom, but his descendant is
Harrison Wells is Don AllenBarry's son from the Future, traveling back in time to save his father and the future
Harrison Wells is Jay Garrick, the original FlashHis powers slow down his aging; the years of retirement have made people forget he existed
Harrison Wells is ImpulseHe's gonna be an Adaptation Distillation/reinterpretation of the character. He travels back in time to save his grandad.
Caitlin will eventually become Killer Frost and turn against Barry.Whether or not it's a case of With Great Power Comes Great Insanity or a genuine Face-Heel Turn, she will eventually gain her own powers and fight against Barry like the Slade/Oliver relationship in Arrow season 2. There will be one or more tear jerking moments involved.
The Flash will get new costumes periodicallyBecause each costume suffers from wear and tear and because Cisco and Caitlin constantly improve on the design on the initial costume in order to improve on both the durability and the streamlining.
Wally West will appear later onHe's initially Iris' nephew who takes an interest in and later idolizes The Flash. However, after an accident involving a villain and electricity, he's fatally wounded until The Flash rescues him, but both get electrocuted. As a result, Wally gains The Flash's powers (as the original comic story would be too contrived to work in live action), forcing Barry to make Wally his apprentice.
If/when Wally West appearsThe writers are going to make him closer to the Pre-N52 Wally West, knowing how well the fans reacted to the way he is written in the comics.
Wally will have a slight Age Lift in the showWhile still Iris' nephew, he'll likely be closer to his late teens than Wally usually is as Kid Flash, as Roy has had in Arrow. That way he can be closer to his comic self's age prior to the reboot but still young enough to be trained by Barry.
In spite of Geoff Johns comments, this and Arrow will be in the DC Cinematic Universe.Because what better way to build up anticipation for the shared universe than to not reveal it until prior to the films?
Dinah Lance will appear at some point.Incredibly out there prediction but she was said to be teaching at Central City university at some point in Arrow.
Cisco will eventually become Vibe, with vibration-inducing powersWith the twist that this version is a HORRIBLE break-dancer.