“Soundtrack apparently has a ‘Diva’ option which is entirely composed of Hatsune Miku versions of the existing BGM”:http://jrpg.jp/news/?eid=16&nid=220.
I’d like to hear some samples!
*Slight addendum 9/18*
Looks like the site updated with a partial “list of producers for Diva mode”:http://jrpg.jp/news/?eid=16&nid=221 – namely,
Not sure how they pulled this one off…