Besides the ones already stated, what would you like?
I would like to see a Oculus 2nd boss mechanic added, where he spawns the dragons to shoot beams, but do something like that with frost wyrms, or make Sindragosa not fully dead, and she comes back to aid the Lich King and then dies finally.
Edit: I would also like to see the 3 main wing bosses give him a buff, and you have to kill their very weak shade forms.