Blow describes the project as "a puzzle-exploration game that is philosophical, and quiet, and is being made for reasons other than crass profit motive." Bless his socks.
While there are few details on what the new game will be, Blow's job posting for a 3D environment concept artist gives a fair indication of what won't be involved:
The majority of [your] portfolio should consist of things absent from the following list: Girls With Big Tits; Barbarians Wielding Axes, Covered in Blood; Aliens; Space Ships; Gangsters Getting Shot in the Face; Orcs; Giant Robots; and, of course, Postapocalyptic Wastelands.
Please never stop writing for the Shack, Alice :) Bless your socks as well.