About new kits, I would like to have a new kit every year. Maybe like the board would give me a few options, and I could recommend this or that one. It's not reallistic, it's the board that decides the kits, not the manager, but still.
I also would like to see more interaction with the board/chairman, not just sometimes when I need something I go talk to them, maybe when on a bad run the chairman could go have a chat with me (either a negative "you better win or else", or a more positive "we have faith that you can turn this around"), that would make sense since one of the questions the press asks sometimes is what's your relationship with the chairman, and that would tie in with this nicely.
Regarding national teams, I would like an automatic national pool, maybe like every player that gets called for U18, U19, etc... should be added automatically, and I would fancy having chats with managers about teaching some of my national team players new positions, or PPMs, and would have better chance of accepting depending of relationship with said manager.
Seeing FIFA16 is going to add women players, I couldn't leave this one out. A new challenge, if one is tired of beating everything with Real Madrid or Man United, has managed San Marino into one of the best national teams, or whatever, why not manage the other gender?
General optimization of the editor is also a must.