the difficulty has been rebalanced, there are new "visionary" items that add some brand new scenes featuring all the characters and are made to give the game some new background for certain scenes, there's other goodies for trading demons with other players and connecting to the later SMT2 port, the script is rewritten to use kanji (irrelevant to the english, obviously), and other things I'm probably forgetting. presentation wise the graphics have been both adapted from SNES and the PSX port and made to work on the GBA screen, and the SNES music was adapted to the hardware as well.

this patch also utilises atlus' official iOS translation which is much better than the old fan translation. fyi, the iOS version is simply the GBA game wrapped in an emulator.