Update: It turns out this was a concept design that Lenovo put out two years ago. It never went into production.
At first glance, the Pocket Yoga looks an awful lot like the Sony Vaio P. It has what appears to be a close to full sized keyboard but no touchpad or wrist area. And the display is significantly longer than it is tall. There’s a pointing device in the upper right hand area of the keyboard, but the images seem to indicate that this isn’t the only way to interact with the device — there’s one picture showing a person holding a stylus up to the display. And there’s a concept drawing that shows about half a dozen Pocket Yoga configurations, surrounded by styluses (styli?). So I think it’s safe to say we’re looking at a touchscreen device.
There’s no word on the price, specifications, physical dimensions, or weight yet. But there is a picture of a Pocket Yoga fitting somewhat comfortably into a back pocket.