User blog comment:G0LD3NF1RE/Dawnguard encounters issues with Playstation/@comment-4248410-20120907234104/@comment-669073-20120908073038

After a quick check on the Skyrim wikipedia page  "Skyrim was conceptualized shortly after the release of Oblivion in 2006. Work on Skyrim did not begin until Fallout 3's release in 2008... Skyrim is powered by Bethesda's own Creation Engine, a new engine created prior to Skyrim's release." So that's about 3 years to create the new engine (Fallout 3 used the Gamebryo engine.) then do everything else.