Some of you may have already noticed, but some of the new features are:
Topic Rating
You can give a 1-5 star rating for each thread. You'll see the (giant) stars at the top of each thread.
Points
This used to just be a post count for how many posts you'd made in the forums. Now it is a point system that tallies up topics you've created, replied to and been thanked for. More points equals a higher title rank under your name. For example, Postmaster, Postmaster General, etc.
Thanking
You'll see in the bar across each post or reply a little smiley face. You can click that to thank the person for their contribution. It's sort of like quoting and adding "+1" but a whole lot less spammy.
Social Media Sharing
At the bottom of each thread is a series of links you can use to share the thread on Facebook, G+, Twitter, etc.
Enjoy!
Luna