The Guest Artist Editions of the various Munchkin sets just keep coming (there are a lot of Munchkin sets, after all). Steve Jackson Games has just announced another couple. Munchkin Cthulhu and Super Munchkin will be getting their own alternate-art sets.
June will be seeing a new Munchkin Cthulhu set drawn by Katie Cook. Meanwhile, August is going to be just super with a new Super Munchkin set illustrated by Art Baltazar.
There's still more sets to be announced, so stay tuned.