CBR has the PR-derived scoop that Grant Morrison's much teased project for Boom! is called Klaus with Dan Mora, described as, well….
I had this notion way back. I was doing the "All-Star Superman" stuff, and I got so into Superman, so into his character, so involved with what we were doing. When I finished, it occurred to me that I'd really love to do this — with a character that wasn't owned by a corporation. [Laughs] I thought about, "Who does everyone know?" "Who's every kid's favorite hero?" I suddenly thought, "How come no one's told the 'Year One' of Santa Claus?" It seems so obvious. Basically, this is my "All-Star Santa Claus." [Laughs] "Santa Claus Year Zero." It's kind of neat approaching that character as if he was the world's greatest superhero, and we've never learned the origin.
Reminds me that I actually put Boom and Grant Morrison in touch years ago, when they were looking for someone to send the royalties for his Steed And Mrs Peel comics that Boom reprinted. I do hope I was of use.