1. If you are replying to an email chain and the other person has not responded, the email comes back to you. In the previous version, the recipient would be the person you sent the original message to, even if they have not responded to your last message.
2. I can't find an area to pop a message out into a separate window so you can continue to navigate while keeping the message up. In the previous version, I believe this icon was on the upper right hand side of the message and looked like two small boxes.
Felix Velazquez Martinez commented