Apple Seeds First iOS 6.1 Beta to Developers
Apple today released the first beta of iOS 6.1 to developers. The beta has a build number of 10B5095f, versus 10A523 (10A525 for the iPhone 5) for the just-released iOS 6.0.1.
Apple mentions a number of changes and known issues, including several related to how developers can integrate Apple's new mapping service in their apps, as well as an improvement to how boarding passes are handled in Passbook, and a few minor changes to Safari.
Registered developers can download the beta via Apple's Developer page.