Although originally developed with the Unigine Engine with support for 64-bit systems and Linux, the developers later switched to the Unreal Engine, making the release of a Linux version unlikely.
YouTube - Primal Carnage - T-Rex Development Footage
They added some new alpha gameplay last week and since I like promoting Indie/underground things I figured I'd post about it.
Graphics look good but they need to brush up on animations of the T-Rex a little. This is only in the Alpha so I'm sure they will by the time of it's final release.
P.S. This is expected to be about $20 for computer gamers.