Is this dlc woven into the main game or some post game stuff?
I haven’t played through KH3 yet.
So basically, there's going to be a patch for the main game that includes new abilities, keyblades, and some minor gameplay stuff like photo mode, difficulty options, etc. There may be more new or changed stuff added to the base game with this patch, but there is no info yet.
ReMind is a $30 DLC that gives you:
-ReMind episode, an expanded/directors cut/not rushed ending
-Limit Episode, endgame boss rush stuff
-secret episode, an epilogue
The stuff you pay for is almost exclusively isolated to the end, but we'll see if the update does anything to the rest of base KH3.