[IGN's hands-on](http://ps3.ign.com/articles/828/828904p1.html) of BlackSite: Area 51's multiplayer reveals that online co-op has been cut from the final version. That, frankly, sucks.
The new multiplayer mode of Abduction, where one player starts the round as a Reborn that must kill all the other Human players, making them Reborn in the process, is intriguing, but not enough to make up for the empty place in our hearts where the promise of online co-op once lived.
The 360 version of BlackSite comes with a few extra perks, such as voice support that not only lets you listen in on constant team chatter, but also allows you to hear anyone in proximity, no matter what team they're on. The PS3 version doesn't have those features, while PC support is still up in the air.