If you're planning on buying From Dust next week, or still haven't picked-up Bastion yet, you may want to do those things through the Microsoft Store. They will give you The Maw for free!
Here are the links:
From Dust: http://www.microsoftstore.com/store/msstore/html/pbPage.SummerOfArcade-From-Dust
That could potentially be 7 games for the price of 5! Cheers!