Alongside the public release of the iOS 6.0.1 update, registered Apple Developers received access to the first beta of iOS 6.1. Included in the release are a variety of minor UI changes, and a new Map Kit aimed at developers to help the built-in Maps app.
iOS 6.1 beta 1 arrives as build 10B5095f, and is compatible with iPad 2, iPad 3, iPhone 5, iPhone 4S, iPhone 4, iPhone 3GS, and iPod touch 4th and 5th gen. Curiously, the early releases of iOS 6.1 beta did not include IPSW for iPad 4 or iPad mini, but those should arrive shortly. Alongside iOS 6.1 beta is also a new version of Xcode 4.6, which is required to build apps for the latest beta iOS.
If you are interested in seeing some of the minor changes thus far included in iOS 6.1 beta, check out 9to5mac’s ongoing thread on the matter.