Earlier today we reported on a Kotaku rumour stating that Bethesda had put Id Software's Doom 4 on ice following the mixed reactions to Rage released earlier this month. Bethesda's marketing wizard Pete Hines went on Twitter to address the issue.
Re: DOOM 4 rumor, games are done when they are done and no title under development at id has been postponed - indefinitely or otherwise.
So in this case, no news is presumably good news. Hopefully we'll hear more about Doom 4 in the near future.