This appears to be the new go-to bonus item for PlayStation Vita games. Sega announced today that the Vita version of Next Hatsune Miku Project Diva will include a custom skin and matching wallpaper. Of course, similar bonus skins were recently announced for Gundam, Persona and Metal Gear.
The bonus item announcement came with official announcement of the game's August 30 release date. We reported on the date earlier in the week from Dengeki PlayStaiton leaks.
Sega also said today to expect additional details on the Vita version of the game in early May.