New in v4.4 (Testflight Beta):
- disappearing messages (with mutual agreement)!
- live messages – they update for all recipients as you type them.
- connection security code verification, for contacts and group members – protect from MITM attacks.
- send animated images and “stickers” (e.g., from GIF and PNG files and 3rd party keyboards)
There’s a 4chan-like site that has this “live” feature, it’s really fun and honestly doesn’t get old. There were people really bad at typing, but it wasn’t such a big deal, and even better if you’re chatting with friends.