Martin says the project is a series of interlocking books, graphic novels and games all part of a universe "as large and diverse and exciting" as those of Marvel and DC - "though somewhat grittier, and considerably more realistic and more consistent".
But while it seems Martin's attention might have been pulled from his hugely successful series A Song of Ice and Fire (upon which Game of Thrones is based), fans need not worry.
Martin has signed an exclusive development agreement with HBO for Thrones, so will not be working on the Wild Cards project. His assistant editor Melinda Snodgrass (Star Trek: The Next Generation, The Outer Limits, Reasonable Doubts) and Gregory Noveck will stand in as executive producers instead.
Marin says: "They know and love the Wild Cards universe almost as well as I do, and I think they will do a terrific job".
Martin hopes Universal Cable Productions - which is behind projects like Mr. Robot, Suits, 12 Monkeys, The Magicians and Killjoys - will have Wild Cards on screens "in the next year or two."