Attack Its Weak Point: Damaging certain enemies sufficiently, like the Tanks or Juggernauts, or Inferno's personal APC, will reveal a glowing weak point that can be attacked For Massive Damage. In particular, hitting a tank's exposed core with a rocket is a One-Hit Kill.
Death from Above: Many missions have you going after Inferno mortar trucks, which in the meantime will try to rain down shells on you... foretold by a glowing red crosshair. In addition, Inferno also has attack choppers and later, rocket choppers.
Coldstrike has all that, plus the ability to air-drop groups of deployable Sentry Guns.
Downloadable Content: Done in a surprising way - if you bought the game before the DLC launched, you get the Reinforcement pack, containing two new renegades, AND the Coldstrike campaign for FREE. - whether this trend will continue, or it was a sort of "feel good" sort-of-christmas present, we don't know.
The Dragon: Surprisingly, Inferno is one to Natasha. And she is someone else's Dragon!
EMP: Diz's ability that disables enemy vehicles. An early upgrade lets it inflict damage.
Expy: Inferno's Mooks of Cobra ones, right down to the red uniforms and flanged helmets. To a lesser extent, the Renegades of G.I. Joe themselves, given their preference for high-speed, highly customized combat vehicles.
Fire Breathing Weapon: For obvious reasons, Inferno's forces love these. Specifically, there are flame infantry and flame trucks that like to chase you around, trying to get you in range. There's also the "Smelter" tanks, which lob fiery mortars at you. You can respond in kind with the Flamer sub-weapon, which Roxy's buggy can be upgraded to spawn with. It has the unique quality of degrading an enemy vehicle's armor in addition to inflicting burn damage over time, meaning that an enemy set alight takes more damage from your machine guns.
Foreshadowing: In the second-to-last mission, you pick up various Inferno intel files. You don't get to actually read them, but their titles are enough. Mixed in with one about Inferno himself are ones named "Coldstrike" and "Shadowhunter". Other Evil Overlords, perhaps?
Luckily My Shield Will Protect Me: Armand's shield ability, as well as Gunnar's "Riot Shield" upgrade, though that only protects from the front where Armand's is all sides. Blazemo also fits in here, as his flame wheel protects him from incoming damage while active.
Nitro Boost: Every vehicle can engage an infinite boost. It's mostly useful for traveling around a map faster, as you cannot fire any weapons while boosting. However, you can get a boost upgrade that allows you to use a quick, even faster boost to evade enemies or put out flames on your car.
Press A To Beat Up SomeMooks: In many levels, you will need to enter certain buildings and rapidly press a button to make something happen, like raising a bridge or planting charges on a key building, or you know... ramming an aircraft carrier into a sealed off lair!. A little panel shows up when you do this, depicting your character beating up a bunch of Mooks and then performing the action.
Reasonable Authority Figure: Genawi, the president of the unspecified African country you visit partway through the game. In return for rescuing his wife and protecting him and his people from Inferno, he lends some intel and resources to your cause.
Recurring Boss: Inferno himself, apparently a proponent of the notion that Evil Overlords can't really trust their minions to defeat the heroes. Not that it does him any good. His Phoenix gunship is itself another example, which is fought three times in one level and reappears later as a Degraded Boss.
Red Right Hand: After defeating him for the first time, part of Inferno's face gets badly burned.
Regenerating Health: Not normally, but certain upgrades can provide a semblance of such. "Auto Repair" restores some health when you are low, and Armand's "Guarded Repair" upgrade causes him to regenerate while his shield is active.
Timed Mission: Technically, all of them, but the time limits are so lenient that they don't even display the timer unless you're slow about shooting what you need to be shooting. A few times, it decides not to screw around and starts the timer below the normal 3-minute warning.
The Cameo: Bought the game on Steam? You get Gordon Freeman and the Charger from Half-Life 2: Episode 2.