nope "Switching to CryENGINE 3 has helped us stay true to our vision and build the Nexuiz arenas the way we see it without any limitations," explains IllFonic president Charles Brungardt. "We are incredibly proud that Nexuiz will be the first downloadable title developed on CryENGINE 3."
Nexuiz will be on the floor at PAX Prime with CryENGINE 3 in full effect. Shacknews will be in attendance for some old-school fragging. The game is scheduled for release this winter.

I understand the frustration that some people have on open source stuff. The same thing happened when Metallica made a ...
I can see where the anger comes from, but it really doesn't seem like it's too much of a dick move here. Like kittygrin...
Barely anyone plays it right now anyway, and the ones that do would almost definitely not make the jump to a new version...