What? I have been waiting for sequel to RED ORCHESTRA? I am sure that's what many of us said when we read this news:

http://ve3d.ign.com/articles/news/45623/Tripwire-Interactive-Announces-Killing-Floor

But if you read this in depth they did mention that this is just a one of the games being worked on. The other seems to be sequel to RO. Hopefully!

Here is more info on KF and on sales of RO:

http://pc.ign.com/articles/964/964778p1.html