Apple has released iOS 5.1 Beta to the developers. Here a few related news story from MacRumors:



Apple Begins Seeding of iOS 5.1 Beta, Xcode 4.3 to Developers

Apple has seeded developers with the first version of iOS 5.1 Beta and Xcode 4.3.iOS SDK 5.1 provides support for developing iOS applications and includes the complete set of Xcode tools, compilers, and frameworks for creating applications for iOS and Mac OS X. These tools include the Xcode IDE and the Instruments analysis tool among many others.

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Next Generation iPhone (5,1) and iPad Also Referenced in iOS 5.1 Beta

iOS 5.1 Beta seems to be a treasure trove of product ids with the exposure of the iPad 2,4 and the J33 codename for the next generation Apple TV. The latest part number to come from iOS 5.1 is the iPhone 5,1 as noted by both @FilippoBiga and 9to5Mac

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iOS 5.1 Beta References Unreleased iPad 2 Variant (iPad2,4)

iOS 5.1 Beta SDK reveals a never seen before iPad product id, according to 9to5Mac. The new product id is "iPad2,4", suggesting a minor variant of the current iPad 2 line.

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