Originally Posted by Gamasutra
Gamasutra: I know it's under wraps, but you guys are probably feeling pretty okay about Unreal Engine 4.
Tim Sweeney: Yeah, we're starting a behind-closed-doors showing of the engine to developers; this is part of our very early ramp-up cycle. We went through this cycle with Unreal Engine 3 starting in 2003 and 2004. At some point we'll make public announcements and ramp up to the point where developers are shipping games, but it's very early right now. We're aiming very high, and the intended platforms this is aimed at haven't even been announced.
He has many more interesting thoughts through the link, with quite a few being things he hasn't expressed before.