They start shipping in December and come with an extra tip and eraser + rechargeable battery that lasts for a month. The focus is being able to write and then smudge with your fingers. Comes in Walnut and Graphite flavors.
The promo video is great:
http://vimeo.com/78124534
http://www.fiftythree.com/pencil
It still might be a little bit thick for most. I still want one though.