Well, at least that’s what the reports from a page on Telstra and Vodafone are showing. The long awaited Windows Phone update Amber, also known as GDR2 will probably be released on August 14. The image shown below shows that update for Nokia Lumia 920 is already in final testing. But the update for Lumia 520, apparently has been postponed. Same goes for Lumia 720 as Nokia has not submitted the firmware update to them yet.
It is not known if Nokia will be pushing out the update to all operators and unlocked phones on the same date. We are keeping our fingers crossed. You should cross them too.