Cube 2 Engine

[rXn]

Maybe look at it the other way round: If we are in the state of "wait-what-they-do-and-copy-it", we will never start. There was a bigger update release of Sauerbraten/Cube2/Red Eclipse just at the beginning of this year, and who knows when they will do the next...It is quite impossible to wait for them to stop releasing like AC did.
Imo you should upload that stuff now. The engine did not have any world-changing changes during, let's say, 2-3 years, so we can do it now as well as anytime else. But if we don't start, we will never be ready .

PS: What about putting all the stuff to a password-protected svn/git/whatyouwant and write the password here? It might save some troubles with people thinking we would just copy Red Eclipse. If it has grown enough, we go and make it public.