On the 3dRealms site there's details of what's coming in the 1.1 Prey patch as well as in the Xbox 360 version.

There's also new content for Prey coming soon -- still in the process of finalizing the new maps. We've read online that some people have requested maps that function well as 1v1 maps. So, we've taken that to heart and have been working on four maps that work better with a smaller number of people 2-4 players. Of course, you can still play with more than four in the maps, but they can get pretty insane.

Also, we're adding in six new player characters:

- Four female characters: Jen, Elhuit, Mother, and Becky (the blond victim you see occasionally on slabs in the single player Prey)
- Two Hunter characters: Hunter and Elite Hunter

Thanks Evil Avatar