id's Carmack talks up Doom 4 - better than Rage
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In an interview with MaximumPC, id Software co-founder and software engineer John Carmack says that the id 5 technology used in Rage has been given such an overhaul that Doom 4 will appear to be an entirely different new game engine all together.
"It's going to look like a totally new game engine on there, even though it's going to be built on the four years of effort that we spent developing this generation of technology."
He goes on to say the Doom 4 will run at 30fps, which is why they can cram so much detail in.
Full interview through the link.