The name of this new bundle is "The Humble Bundle Mojam" where "Mojang and friends create games from scratch in the span of a weekend! Pay what you want to get the games, and all proceeds go to your choice of four excellent charities!"
The game that the Mojang team is creating is called "Catacomb Snatch" while the games coming out of Wolfire and Oxeye Game Studio have yet to be named. Mojang is the company behind the popular Minecraft title.
As of publishing there's been $244,806 USD generated so far this weekend from 43,080 purchases ($5.68 USD floating average). Also differentiating this bundle from earlier bundles is that all of the proceeds will be donated to charity. The supported charities this time around are Child's Play, Electronic Frontier Foundation, charity: water, and the American Red Cross.
As always, from HumbleBundle.com you can order the latest bundle while time remains. From the web-site this time around you can watch the three teams in real-time as they develop their games. Below is the video trailer announcing this weekend game development bundle.