Natural Selection 2 Classic
Many of you have probably heard about this already, but here's the official post.http://www.ns2cmod.com/
Further details will be forthcoming soon, 221 came later than I expected which delayed this somewhat. In the meantime you can enjoy the teaser of whats to come!
You can also read an excellent preview of the mod and its state here:
http://ns2cmodpreview.com/