Apple has just released the third beta of iOS 6. 9to5mac
Beta 3 also seems to have a new iCloud welcome screen through which to enter a security question and some minor fixes with iTunes Match when downloading all songs in a playlist and downloading or deleting individual songs.
Like the beta 2, the expiration date of this new beta (the build 10B5117b) is still next December 28th at 12 am (GMT) so we can count on Apple to release a new update before that date. Will it be the final one?