The featureset of the engine is very similar to what John Carmack has built for Doom3. You could be naughty and steal his thunder by releasing a test version of Chaser before Id releases a playable build of Doom :) Are you likely to release a public test version before going gold?

As I mentioned above we finally decided not to use dynamic per-pixel lighting so technical part of Chaser will not be a competitor to Doom 3 engine. Of course we can make a multiplayer level with dynamic lighting, which is available in the engine; some kind of 'darkmatch' with flashlights and release it as a test but we have no plans for anything like this at the moment. As for releasing a public test version or demo of Chaser, all will depend on our publisher.