There's lots of scuttlebut about it in the TES V speculation thread, I'm stoked! I just reactivated my forum account just because I had to confirm what I read on another site!
Announced is a bit of a strong word. But like monkeybread I'm 21 and have been on this series since my teens, so any news, even like this, is exciting.
Announced? Not even close. In August Todd said they were far along the developement of their new game and it had a new engine but he never said what the game was. Yes there's a rumor flying around that someone broke their NDA and leaked that it was an Elder Scrolls game but that's still hardly an announcement - heck it's hardly a rumor.
If you want to discuss this please use the official TES V speculation thread.