Next version of iOS with overhauled notifications, lock screen, Messages, Apple Music, and much more.
Apple Seeds New iPhone OS 2.0 Beta (5A240d), SDK Update (Beta 3)
The updated iPhone beta firmware, version 5A240d, includes a number of fixes and new features centered on Exchange support, including the additional abilities of receiving and accepting meeting invitations, searching for contacts in the global address list, auto-complete email addresses in the global address list, and setting up an exchange account using Autodiscovery (Exchange 2007).
The final version of the firmware is expected in June as a free update for iPhone users and for a small fee for iPod Touch users.
Today's iPhone OS beta replaces the build originally seeded to developers, which incidentally had timed out today.