I don't see it on Engadget, but The Verge says that Vizio DID announce a 10" Android tablet today!
Vizio's 10-inch tablet combines Tegra 4, stock Android, and an ultra-light body (hands-on)
No price or release date, and I'd have preferred a 4:3 aspect ratio, but the fact that it will run stock Jelly Bean is cause for celebration.
Edit: and a 7" tablet as well.