In a Walkie Talkie conversation, a deleted message is now one line of small grey text instead of a box with a time under it, and deleted messages in a row share one line, such as "4 messages deleted".
Pressing Play no longer moves the conversation: the playing recording's controls take the place of the line above the Talk button, and the recording keeps its width. Pressing the Talk button pauses a recording that is playing, so it is not recorded into your message.
After you record, Send is larger and on its own row, under Play it back and Delete. Times show without a leading zero, such as 9:12 p.m. Start a video call is no longer in a conversation's More menu.