Mojang, the company behind the famous Minecraft game and HumbleBundle are starting, this Friday (February 17th) at 10CET the "Mojam".
Mojang will create a game, live, in 60 hours.They will do a live-stream of this event.
You willl be able to get this game if you donate during these 60 hours. They will also be "some fun and silly incentives for reaching certain amounts of money" and giveaways during Mojam.
If you want more informations, check the source below. You can also vote for the genre and the theme !
EDIT : It's up ! http://www.humblebundle.com/