GameFan.com has posted a Q&A session with Epic's Tim Sweeney, talking about the Unreal engine. Here's a quote with an update on several Unreal-related issues:

All features for the gold master are finalized. We're just tweaking and bug-fixing phase now.

There is some stuff in the works that we were planning on releasing after UT ships, that are already in progress. Brandon's Linux client port is up and running and should be ready by release time; and some very very much improved server admin tools are in the works. If they are wrapped up sooner than planned, we might include them on the CD. Otherwise they'll be available after release as originally planned.