Dinkar - 9:30 pm on Oct 28, 2013 (gmt 0)
Automatic update for new version is a stupid thing to do because of plugins and theme compatibility issue.
But it can be done for old(previous) version as they can check if the current plugins and theme are compatible or not.
BTW, I am not updating it now. Actually, I almost never update immediately. I prefer to wait for few weeks.
Those who are updating, don't forget to take backups before doing so.