Something that isn't a bug, but should be reverted back.
When texting a long message, the text area keeps expanding and now eventually fills up the whole screen. Now if the other persons text was long, and you were replying to several parts...you now can't read the rest of their text, and have to delete some of yours to do so. There should be a limit to how much the text box can expand(like previous versions). I don't mind scrolling through my own message to read what I've put so far, but I DO need to see the other persons text. It can't block it out completely.
Just noticed that if you want to see the text you were replying to, but can't cos you've filled up the whole screen, just tap the edit button and you can see all the previous messages. When you're done tap "done" and it will take you back to the text you were writing.