The gameplay has not been changed that much. What has changed is there are four new operatives (Louis Louiselle, Homer Johnston, Eddie Price, and Dieter Weber), three new weapons (.50 Desert Eagle, G36K, G3KA4), two new training missions, and five new campaigns. There are some really cool new modes to fuel your fire. Full Watch this mode is for singleplayer observation, where have control over all teams. You don't physically use any member but you can pass go codes, hold and release, switch views and so forth. The main thing about EW is the multiplayer improvements, which are numerous in nature. The four new concepts are Scatter, Assassin, Terrorist Hunt and Save the Base. In Scatter Mode the players on each team are placed in random positions. In Assassin Mode, each team starts with a non-combatant-The General, if the opposite team shoots him, the game will end. In Terrorist Hunt, Each team must shoot at least half of the terrorist to win. Don't forget about the other team too. Finally, Save the Base, each team is tasked with defusing a powerful bomb, which is located in the other team's base.
There is no over-arching storyline, just five unrelated hostage rescue missions.