The retailers were right. Konami has finally officially announced a June 12 North American launch date for Metal Gear Solid HD Collection on the PlayStation Vita and it's unsurprisingly June 12 in North America. The Vita port includes new control options, utilizing the touch-screen and rear touchpad, allowing players to "zoom in on captivating cut-scenes, peek around corners, interrogate enemies, cycle through weapons, and perform rapid attacks with their knife."
In addition to the new control options, the PS Vita version of Metal Gear Solid HD Collection can use Transfarring to sync save files with the PS3 game. Of course to use this feature you need to own Metal Gear Solid HD Collection on both the PS3 and PS Vita.