With the slew of Warhead preview articles, including this most recent Czech preview, there is lots of new information on just what Crysis Warhead will include. Tiscali Games has taken the liberty to list out all of the known Warhead points.

Begins when the original game’s Nomad character parts ways with Warhead’s new hero, Psycho, and follows him all the way until the two are to reunite again on board the aircraft carrier.

Mostly located on the other side of the island.

Less linear approach and more sandbox type of gameplay, as opposed to the original.

Same nanosuit and the same functions, with more likely to be revealed later (definitely a "surprise" in that matter is promised).

Singleplayer campaign to last 8-10 hours.

At least two new weapons, the granade launcher and double SMG.

Improved enemy AI, betterily able to organize itself and follow tactics.

New vehicles incl. Armored Scout Recon (about the size of a jeep with a mounted gun) and a hovercraft, both playable in multiplayer as well.

New team-based MP mode and less complex than the original two.

Betterily optimized to run faster than the original game on the same hardware.

Won’t require DX10 for maximum details and full effects.

Dialogues done by Bioshock’s Susanna O’Connor.

Completely stand-alone and as noted by developers, not an add-on but a full title.

The possibility of Crysis 2 to rely heavily on Warhead’s sales.

Perhaps most interesting isn’t the new weapons, vehicles, and multiplayer mode, but the gamble on Crysis 2 based directly on the sales of Warhead. So fans of the Crysis series who want to see the Nano technology used elsewhere, be sure to support the series by purchasing Warhead, the last of the Crytek’s PC exclusives. Source