To do:
Version differences. Detail the Japanese Original Game Sound Edition. Additionally, the blog on the official japanese website has numerous screenshots and even concept art that definitely have differences, put it into a prerelease page. Not to mention Bayonetta being a scrapped character as well.
Project X Zone 2 is the followup to Project X Zone, but this time there are Nintendo characters! When will it ever end?! Right here, actually, this is the last game in the series so far.