Well heres a few but I doubt any of them will be in the update.
1) Correct their drastic mistake of making RGB Green Screen Playback.
2) Allow the PS2 to change screen size whilst the video is playing.
3) Allow the PS2 to change output volume with the DTS option enabled.
4) Multiregion would also be nice.
But I really do doubt that any of these will be fixed / altered.