Literally cant wait for this to come out, it sounds absolutely amazing!! Unless they have cocked something up big time i think this could be the next big thing. For starters, for all of you who miss zombies on WAW there is a new alternative. I think the mode is called survival, 4 player coop against wave after wave of aliens!! There is also a mode kind of like bulldog. 8 players and one person is assigned to be an alien. Each time you are killed by the alien you respawn as an alien until one person remains who gets a heavy weapon drop.
There is also the standard species deathmatch and multi species deathmatch (could be good depending on the pros and cons of each species, it sounds pretty even though, but teamwork required for marines.
The single player looks pant browningly good with a seperate campaign for each species. I can just imagine the joy of manically emptying a whole clip in a pulse cannon whilst yelling "theyre coming out of the ****ing wallls!!!" or "game over man, game over". Literally cant wait, heres a picture to whet your appetite: