updated 02:45 pm EDT, Mon June 25, 2012
Specifc changes still unknown
Apple is now distributing a second beta of iOS 6 to developers. The update is reportedly labeled build 10A5338d, and measures 322MB. Its exact contents are unsure, since Apple only lists changes as including "bug fixes and improvements."
Typically, however, subsequent iOS betas gradually bring new features online, if often just minor ones. It may take several days for developers to discover any significant additions. The finished version of iOS 6 is scheduled to go live sometime in the fall; most likely it will launch shortly before the arrival of a next-generation iPhone.