We can have Private Talking.In this we can talk to the person you chose to tell a secret or something like that and others will not hear it.If we want Private Talking,we would have the option in the player list.when chosen,we would have players to choose who do you want to have a private conversation.You can choose one or more players.It would not apply for single player and two player game.
My Suggestions:
http://www.minecraftforum.net/forums/minecraft-discussion/suggestions/2488679-custom-music-disc
Ehh...This ^^^
I can't really see any use of this besides for like
Mini games or whatever and what not...
Plus we've got party chat.