from Blackberry review (link)
"Sorry for the text only article but I’m writing direct from my device. I’m in a BlackBerry Seminar and have pinned the RIM spokesman to a release date for the new device OS 4.5. Seems it will officially be released today (Friday 25/07/08) on Optus in Australia. Worldwide roll-out across all carriers will be within the next 2 weeks.
So for those of you who have not updated using one of the leaked Beta’s then the wait is almost over."

oops, wrong forum.

Been posted here several times, and "Official Release" is a bunch of BS. Its been official released for weeks now. *closed*