According to this interview, 30fps is what they're IDEALLY pushing for, meaning it might not even be a steady 30fps. Regarding resolution, CDPR says that the possibility of 1080p is a "probably not".
From the interview with CD Projekt Red's Jose Teixeira
Ideally, we’re pushing for 30 frames per second. The resolution, honestly, it depends; we’re working on it, we’re trying to get it as high as possible. If we can make it at 1080P, sure, but I don’t know if it’s going to make it. To be honest, I really don’t know. Probably not. But for sure, we need it to run at a smooth frame rate, so at least 30 FPS.Read more at http://www.worldsfactory.net/2014/08/20/the-witcher-3-probably-not-1080p-on-consoles#vFVm6ITmAtRfz2dE.99