Apple released the third edition of its mobile platform Monday, iOS 5 beta 3.  Registered Apple devs can now download the beta, also known as “build 9a5259f”, via Apple’s developer centre.

The newest version for iPad, iPhone and iPod touch devices coincides with the latest iTunes beta, version 10.5. Plenty of bug fixes and tweaks are among the notable changes, according to Apple’s official release notes:

  • Push and local notifications for apps appear in the new Notification Center in iOS 5. Notification Center displays notifications that are considered “unread.” In order to accommodate push and local notifications that have no “unread” status, developers can use their application badge count to trigger a clearing of notifications from Notification Center. When an application clears its badge count (by setting it to zero), iOS 5 will clear its notifications from Notification Center.
  • iMessage beta 3 will be unable to communicate with iMessage users on beta 1. It works between beta 3 and beta 2
  • Modal alerts don’t appear for iMessages.
  • When tweeting your location from Safari and exiting before the location can be established, the location arrow will stay in the status bar. The arrow can be removed by killing Safari from the task switcher.
  • FIXED: The Reminders application does not send notifications for reminders that are based upon the entry (and/or exit) of a location if there is no date associated with the reminder.
  • In this beta, the option of “Choosing a security question” is not working during an iCloud account setup.
  • FIXED: After creating a recurring event locally on the device, the device stops syncing after hitting an error on merge. Removing and re-adding the account acts as a workaround for this.
  • Restoring from a Seed 1 backup or earlier will cause MobileMe/iCloud calendars not to sync. Subscribed calendars will show up in Calendars but none of your event calendars will appear in MobileCal. To work around the problem please remove and re-add the account.