The release date was taken from a Famitsu article
https://www.famitsu.com/news/201703/16129023.html
発売日：2017年5月4日
Several other sites mirror this info (like Yahoo and 4gamer)
When it says ※インティ・ダイレクト先行販売を行います。商品発送予定日は2017年4月25日（火）です。 it seems to be talking about a preceding sale on Inti Direct.
Difference between the PAX East 2017 version and this Japanese version at the very least is that it has a total of 29 tracks. It's got to be slightly different, comparing e.g. Track 08 NORA-2057: Eve on the US release and Track 09 イヴ NORA-2057 on the JP release.