Gamasutra today has an interview with Wideload Games' Alexander Seropian. He talks about how Wideload's outsourcing model has worked out, the modifications they made to the original Halo engine, and dealing with the challenges of a cross-platform release:

Having an engine that has already shipped on all three of those platforms certainly helped, as did having a partner in Aspyr Media, a company that has lots of experience with Mac and PC development. We also spent a lot of time early on getting our codebase operational on all three platforms.

Stubbs is expected out this October.