X201. But go to Lenovo's spec sheet repository and you'll find a lush PDF file detailing a new ThinkPad X220 model that seems set to become available very shortly indeed. Sized at a somewhat unconventional 12.5 inches, this fresh contender will feature a new "buttonless" touchpad -- though it retains the mouse keys in support of the TrackPoint navigator -- while offering the sweet nectar of a 1366 x 768 IPS display, up to a 2.7GHz Core i7-2620M CPU, 8GB of DDR3 RAM, and a choice of Intel SSDs ranging up to 160GB. The 9-cell battery is rated to last you 15 hours and there's an additional external battery pack that will keep you tether-free for 23 hours. Click past the break for the full specs.
Update: Hello! The X220 Tablet is listed on Lenovo's site as well. Thanks, Joe!