The latest beta of iOS 6 is out and available now for developers. The iOS 6.1 beta has a build number of 10B5105c. Apple notes a few changes for this beta release including minor Safari changes, better iOS 6 Maps integration for developers, and an improvement for boarding passes in Passbook.
The recent release of iOS 6.0.1 added very little for devices other than the iPhone 5. It looks like these beta builds aren’t very special at the moment either, but definitely are crucial for app development. If anything new is discovered, I’ll be sure and let you know.