Still no word on availability from Lenovo, but reviewers have apparently had their hands on the new Thinkpad 10 tablet for a while.
Paul Thurrott published his first impressions earlier today and now Lisa Gade of Mobile Tech Review has posted a very informative video review.
The machine is probably under-powered for most art applications, but its Wacom digitizer nonetheless makes it an interesting competitor to the $799 Core i3 Surface Pro 3.
One of these days, Lenovo may add me to their reviewers list, but in the meantime, here is Lisa's video. She begins discussing the pen at around the 9 minute mark.