In a series of tweets, the Official English Kingdom Hearts twitter account confirmed that Kingdom Hearts HD 1.5 + 2.5 ReMIX will have a day 1 patch to bring it up to parity with the Japanese version, which released earlier this month.
#KH Community, thanks for your questions! We're addressing various issues before the game releases on Mar 28th (NA) & Mar 31st (EU). (1/2)— Kingdom Hearts (@KINGDOMHEARTS) March 23, 2017
For NA and EU players, a Day 1 patch will be available at launch to match the JP update. We’ll keep an eye out for additional notes. (2/2)— Kingdom Hearts (@KINGDOMHEARTS) March 23, 2017
Kingdom Hearts HD 1.5 + 2.5 ReMIX has caught the attention of fans worldwide after it was discovered to contain a plethora of issues including broken physics due to the 60fps upgrade and certain boss fights becoming more difficult than they should be.
Patch 1.02 for the Japanese version of Kingdom Hearts HD 1.5 + 2.5 ReMIX fixed a few of these issues, namely the battle with Vexen in Kingdom Hearts II Final Mix, however issues from the Playstation 3 release such as the reaction command in one of the battles with Xemnas is still broken. Bizkit047 compiled a list of issues they have with the game, which you can view here. It is clear the Kingdom Hearts team is listening to feedback, which you can send via the twitter (linked above) or through their support channels.
Follow Kingdom Hearts Insider on Facebook, Twitter, and Tumblr for the latest updates on Kingdom Hearts Union X[Cross], Kingdom Hearts 3, Kingdom Hearts HD 1.5 + 2.5 ReMIX and all things Kingdom Hearts!