The two most important new features are the Quick Reply Box now present at the bottom of each post, and the new ability to subscribe to topics while you're replying (using the full reply form). If you'd rather not use Quick Reply, you can turn it off by editing your profile/preferences. The My Profile page and Edit Profile pages have been given a facelift as well. The Quick Reply preference is at the bottom. From the My Profile page, you can now view all of your current topic subscriptions, then remove them if you desire.