The bundle went up today and was announced on the Major Nelson blog. The games are available individually on the Xbox Live Marketplace for $10 each (except Comic Jumper, which is $15), so buying the bundle is a better deal. The blog notes that if you already own one, the bundle doesn't offer an additional discount, and you don't get an additional copy of the game.
Twisted Pixel tells us that the deal is "for a limited time only," and that the promotion "won't last long so get it while you can."
Steve Watts posted a new article, Twisted Pixel bundle includes four games for only $10.
The Twisted Pixel bundle has launched on Xbox Live Marketplace today, offering The Maw, Comic Jumper, Splosion Man, and Ms. Splosion Man all together for $10.