As much as I am a fan of the FFVII UI looks wise I dont think a futuristic FFXIII is in keeping of the game, however I think the current UI could be given a little bit of sparkle and still be in keeping with the game's aestics.

The functionality of the UI needs to be improved, Yoshi-P did suggest back in Feb/Mar that two UI's could run in tandem a PC based 'drag and drop' style UI and a PS3 controller friendly UI. Hopefully more details will become clear closer to the mega patch in June if any UI changes will be made. (crosses fingers)