I can't remember where, but I believe somewhere within the Dead Flip stream of GB, zombie yeti said he was working on another game for stern.
And then there is also Dirty Donny, who helped with art on the Metallica pin, say on his Instagram March 3rd that he's working with stern on a new secret project.
That's all I got. Whatever it is, there seems to be a good chance it's going to have custom art, which I like.