http://www.moetron.com/2012/06/06/hatsune-miku-project-diva-f-tech-demo-at-e3/

From other sources (and working at the convention center), reviews on the Vita was positive at the Sony booth. It was only used as a demo to show the usefulness of the PS Vita. In the demo, the menu was in English while the rest of the game are still in Japanese. Some say it might be a possibility that they'll launch a debut game in the U.S.

If you guys haven't noticed, Project Diva F will be released later this year in Japan for the PS Vita and for the first time for the PS3 next year (not considered a Dreamy Theatre version).