FYI Fern's post is good read indeed as usual but one info that JP blog post had the NA one didn't

蛮神シヴァとのバトルはリローンチ後になるのですが、
開発側はβテストやリリース向けだけでなく、
こうした新生後のパッチ作業にも突入しています！
Battle with Primal Shiva will be post relaunch, but this is to show that the development team is not only working towards beta and release but post ARR launch patches already!
Good info imo.