FileShack have posted a test build of Quake II using the Doom 3 engine
Get your guns and gear ready for this action packed remix of Quake II within the DOOM 3 engine. Engage in high combat situations in all new areas with all new gameplay. Fight various Strogg enemies along your way including Enforcers, Light Guards and Flyers. Take them out with your Blaster, Double Barrel Shotgun, or other aresenal that you come across. Find secrets and secret areas and powerups. Unlock secret extra content, and much more!
Download: Quake II: Lost Marine QuakeCon 2005 Test Build | 265.8 MB