The budget-mainstream 10.1-inch VivoTab ME400C is available now and runs on a Clover Trail Atom Z2760 starting at 500 Euros with an optional Bluetooth keyboard dock.
http://www.notebookcheck.net/Asus-launches-Atom-powered-VivoTab-ME400C-tablet.87152.0.html
Finally the Asus VivoTab Smart - Full Windows 8 - has landed in the US. ValleySeek.com report having them in stock from today. (I pre-ordered mine elsewhere, but the above is good indication that things are 'moving').