XDA, always a step ahead, eh? Today, WPCentral reported about Microsoft employees receiving Mango RTM build which triggered a thread in XDA and user longshot442 did a noble act of posting download link to necessary files required to upgrade to Mango build. More after the break.
Now - before you " Go boldly where no man has gone before " you better make sure you have a backup in case you are transition from 7392 to 7720.
Download link and procedure to update your device available on XDA.
Several users reported successful upgrade. I personally haven't been able to test this, yet. You can always go back to your backup state, so it's worth a shot.
If you are wondering if it will screw up the ability of your device to receive future official updates (remember Walshified phones?) then the answer is 'maybe'. What we can tell you that a certain user received the HTC Firmware upgrade after the 7720 switch so it just might go smooth after all. One slightly weird feedback I noticed, a user reported that he was unable to find an option to find Hidden Wifi feature on RTM which was promised by Microsoft to be released in the RTM build. Strange. No unusual behavior as noted by the testers. Give this build a try and let us know.