Threading, better search, tagging, sharing message bits with others, temporary group messages, better in-message features (polls, lists), better ways to send mu

Threading, better search, tagging, sharing message bits with others, temporary group messages, better in-message features (polls, lists), better ways to send multiple pieces of media in a singular unit, ways to spend "live" time within imessage, higher-level walkie-talkie, ways to schedule messages, ways to send longer forms ("bursting the bubble"), sending rich text in messages,......