Some benchmarks are already out there! Just google Intel Medfield and benchmarks. Learn how to learn in DaHood, Just sift through all the crap hits, and go to the links with the useful info!
A few months back I got the chance to play with a Medfield prototype designed by a US company at an Intel event. I would not be at all surprised if someone beat Lenovo to the punch.
The US has a saturated cell phone market, and a shrinking disposable income, china and India have a growing middle class and a un-saturated cell phone market!