Can I See Some id? Announcement Tonight

Veteran news-commandos over at Eurogamer have spotted a tweet by John Carmack saying that id will be announcing a new game at QuakeCon tonight. In all likelihood this'll happen during his keynote speech, which starts at 8:30pm UK time or 2:30pm Dallas / CDT time.

What could it be! Well, we kind of know what it'll be. It'll be Doom 4. We know id started work on Doom 4 back in 2008, and in 2009 they said that they'd be talking about it at QuakeCon 2010. Still, exciting! We only have some 10 hours of precious ignorance left! Let's make some wild assumptions. I think Doom 4 will be a shooter, featuring some kind of gun, with emergent weaponry based on repurposing the body parts of various demons. Like, dual-wielded kidneys, or perhaps a whip made of intestines. What do you think, readers?