It is just a redesign. I didn't see any new features yet. BIG EDIT: http://gbatemp.net/t310728-welcome-to-gbatemp-v3
Oh , that would be a nice idea but the software that GBAtemp is using isn't free I think. SMF, which RomU uses is free.
The update was from an old 2.x.x or something forum software to the newest 3. forum software. Pretty drastic overhaul under the hood, and plenty of new features for everyone else. And no, their forum software is not free.