Put a gear on it! That'll make it Steampunk!
Ok, so steampunk is a lot more than just adding a gear to it. There's also brass and copper pipes and so forth. Also, Munchkin. Well, you can have Steampunk without Munchkin, and you can have Munchkin without Steampunk. But you can also have them both together. Steve Jackson has already released Munchkin Steampunk Deluxe, but for those that want just the regular set, you can pick that up soon, too.
The set is illustrated by Phil Foglio, and as usual, will be able to be played mixed in with your other Munchkin sets (just curious, has anyone ever mixed together a whole bunch of sets and just had, like, a 4' high stack of Munckin cards?). Expect to see the set on store shelves in February.