Start the countdown clock, Verizon Thunderbolt owners: AndroidAndMe has it on good word that your handsets are just days away from an update to Android v2.3.4.

If their tipster’s tips hold true, the update should starting hitting handsets come June 30th. And the internal memo they brought along as proof? If that one’s legit, this build of v2.3.4 comes preloaded with Sense 2.1, some aGPS improvements, the Amazon App Store, and Skype/gChat video chat support.

Of course, we’re talking about a software update here. Between last minute bug discoveries and roll-out hangups, the ship dates for these things are generally about as solid as a pudding skyscraper. Until we hear otherwise, though, keep your calendars marked.