I meant to write a post about this last night, but frankly ran out of time. You'll notice the site has undergone some changes overnight.
Basically, it's just (in SBN's developers' words) a visual "refresh," which is an update of the previous design. It's an effort to make the site more friendly to read, and is the first step towards some other behind-the-scenes stuff SBN is working on.
Here's what it isn't: A new version of CougCenter/SBN. All the functionality remains the same. FanPosts, FanShots, commenting, etc. all remain the same. There are no new features, no new functionality.
If you discover that you're having any issues with the new setup, e-mail the support guys.
Personally? I love it.