Can one get Hatsune Miku, Project Diva in english for the psvita?

A Dandy Guy is half right. Project Diva f has been out in the US for months, The PD games for the PSP were never released over here, but all of them have unofficial English patches if you download the games. With a hacked PSP you could download them all for free. I can't go into detail on how to do that on here, but a google search should yield tons of results.

I have Project Diva 1, 2nd, and Extend with menus and items translated into English. They also have the song names and lyrics in romaji.

Project Diva F is already out on the Vita in the US, in English. It's been out since March.

There are no patches for the PSP games as far as I know and you don't need any Japanese knowledge to play them anyway. You also would have to get a Japanese PSN account to get them anyway since the Vita only supports downloaded PSP titles.

I think this is the game they're releasing in the US, so yes. You can check Gamestop's website for Vita games. They show upcoming releases as well.

Otherwise, I believe the Vita is not region-locked, so you can import games for it, if you wish.

Can I have more info on this?