It hasn't been officially announced yet (although we can expect something official probably by the time GDC 2012 rolls around) but God of War IV is already being talked about heavily, especially after co-op rumors surfaced and the game appeared on a composer's resume.
Shacknews picked up a story originally spotted by Siliconera, where composer Timothy Williams has supposedly added God of War IV to his illustrious career profile. At this point in the game it's hard to even deny that Sony is working on a God of War IV given all the talk and evidence. Heck, the main image comes courtesy of a retail poster where the game is scheduled to release in late 2012 exclusively for the PS3.
At present, Mr. Timothy Williams is supposedly working on Defense of the Ancients 2, which is being scheduled to release as soon as possible sometime this year, so says Valve. I imagine Williams has already finished up or is finishing up work on DotA 2 to either continue work on or get back to work on God of War IV.
If Sony was planning on keeping GoW IV a secret they kind of did a terrible job of hiding it from the general public.
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