Gameplay
The demo at the Game Developers Conference indicated that much of the core gameplay elements that were central to Gears of War (a third-person game that has a heavy emphasis on using protective cover rather than "run and gun" style game play) would be present in the sequel.
John DiMaggio, the voice actor of the game's main character, Marcus Fenix, confirmed to IGN that players would be able to fight the large Brumaks in Gears of War 2. He also revealed there will be a deeper story with new characters, new weapons, and new enemies. The game will also include the ability for a player to duel with an AI or human opponent when both use the chainsaw attachment of the Lancer rifle, as seen in the 2008 Game Developer's Conference promotional video, later confirmed in informal interviews with developers and a Game Informer preview. Epic released a gameplay video which revealed the player may now use "downed" enemies as shields. Bleszinski confirmed also that players who have been injured can crawl as a final desperate attempt at life. Players would tap the 'A' Button to crawl faster etc. The level of blood and gore will also be increased, for example, when the player is close to death, wherever he moves there will be trails of blood behind him etc. This is the same for enemies, and the opponents who've been used as a meat shield. There will also be more ways to kill an opponent, such as punching them while they are downed, using the sniper rifle as a sledgehammer, or using the torque bow as an axe.
The cover story in the May 2008 issue of Game Informer revealed several new gameplay features. Players can now play on individual co-op play settings. One player may, for instance, play on Casual while the teammate plays on Hardcore. A "communal combat system" will adapt to give a player at a lower difficulty an equivalently fair challenge as the player at higher difficulty. The player will be able to maintain multiple save files that work with the drop-in/drop-out co-op features. There will also be a fourth difficulty level that is a level below Casual; senior producer Rod Fergusson admitted that — for the first game — "We overshot on [the Casual] difficulty and a game that was a little harder than we intended." Some of the Xbox Live achievements can be completed through both play in single player and multiplayer mode, such as achieving 1,000 headshots. New enemy creatures are planned on being added, including one described by Cliff Bleszinski as one "that [makes] the Brumak look like a baby panda bear."
The collection of COG tags has been expanded to include the collection of story-based items such as personal letters and medical records, and a "war journal" will track which collectibles have been found and where missing ones can be located. The cut-scenes will also use the better facial rendering technology of the Epic engine, and will use more dramatic angles for the conversation, as well as using a video screen on Jack (the all-purpose robot used by Dom) to talk with their commanders "face-to-face."
New weapons have been announced as well as the return of weapons from the previous game. The accuracy, function, and power of several weapons has been altered, and all grenades can now be used as mines by placing them on walls or floors, and will detonate when approached by enemies. In addition, players can now be knocked over by the concussive force of a nearby detonating grenade. Cliff Bleszinski has also announced that there will be more vehicle missions in the campaign than before, such as the Centaur Tank which Cliff describes as a "tank with monster truck wheels."
Multiplayer
Gears of Wars 2 features an upgraded multiplayer mode that will allow up to ten users to simultaneously play. X360 magazine reported that Gears of War 2 will contain at least three online multiplayer modes, called "Guardian," "Wingman," and "Submission." "Guardian" is essentially a modified version of "Assassination" from the original Gears of War, but allows players to continue fighting after the leader has been killed, but losing the ability to respawn. "Wingman" splits all ten players into five teams of two, where both members of a team play as the same character. "Submission," formerly known as "Meat Flag," is a version of capture the flag in which players attempt to "down" an enemy controlled by the game's AI and move its body to their team's base to earn points. A Halo-like matchmaking system will be utilized for the online multiplayer. In a GameTrailers TV E3 special, it was confirmed that bots will be available in multiplayer, but this feature was not elaborated upon.
Cameras in the multiplayer modes have also been improved significantly. Rather than static views from different points on a map, the new Battle Cam allows players to pan around a map as the camera focuses on areas of intense fighting, and the Ghost Cam allows a player to roam freely around a map. A photo mode will also be featured, with each photo taken by a player rated on the amount of action in the shot.
Regarding multiplayer-specific achievements, certain achievements such as getting a defined number of kills with a weapon have been altered. For example, to get an achievement which requires 500 kills with a weapon or 500 headshots, only the first kill or headshot made by a player in a given multplayer match will count towards the achievement. Cliff Bleszinski mentioned that this change was to emphasize the objectives of a multiplayer mode.