I saw this on 1up :
I'm there on day one .
Fueled by DOOM being a breakout hit on Xbox Live arcade, Carmack let it slip that Quake Arena is coming as a digital download. He didn't have much to share about that -- but that didn't stop him from also talking about a next-gen Quake Arena."We've already started this where I've pulled a kernel of a team over and we've begun hiring others to eventually make an Id Tech 5 Quake Arena title where it's back to the high-speed action and..."
Wait a second. Did he just let slip that he's actively planning the next Quake Arena game? Yep. "Quake III: Arena remains my favorite id game because it was so pure a concept. It wasn't our most popular game, but it was popular enough," he says.
http://www.1up.com/do/newsStory?cId=3161744
I'm there on day one .