The demo for Prey is going to be available via
GameSpot on Wednesday June 21 at 9:00 pm Pacific time. The Prey demo will have one hour of gameplay and includes both a single-player mode and two multiplayer maps.
Defy the law of nature with gravity flipping, a feature that allows you to walk on ceilings and turns deathmatch mode upside-down. Explore unreachable areas with wall walking, and transport from one sphere to another through space-bending portals.
I will put up a demo server as soon as I get a chance.
Update: There is no dedicated server with the demo, only in the full release. Guess we'll have to wait, sorry.