User blog comment:The Milkman/Twitter Responses: Bethesda Still Having Issues/@comment-172.218.243.61-20121007114816/@comment-3202167-20121007210830

Sony said they want to take their sweet time with it. And they said that.. I think last year? so 2013 for the PS4 seems unlikely.

And Beth have the habit of working on their next game right after the current one releases, and I don't think Sony handed out any dev kits to third party yet.