A new default Music app for starters.
IMHO, the way we move icons around on the same screen is OK, but from screen to screen is very awkward (for me). If you try to move an icon over two screens all the icons shift and it sometimes doesn't want to go in the right place, etc. It seems to give me a hard time crossing "screens", like there is a physical speed bump there making it more difficult. When you download new apps and have to move them into place, it's a real pain. I do like the way Android does it better. A more cut and paste like option would be better, instead of dragging the icon over and through already organized apps. Maybe sorting options per "screen". All games go on screen 2, all social apps go on screen 3.
Anyway, I would like that revamped.