I'm on the fence about this since I just decided I want to put some more work into my last jam entry to make it multiplayer and add a story mode.
If I'm feelin' up to it around December 21st, then I'll probably use HTML5/Javascript and ImpactJS.
Also, if any artists/music guys want a programmer and are willing to work with me then I would def be in. I want to work with other people with different skills than my own, and I suck at those things. I have experience with Unity3D if that helps (no pro version though).