I'm not really excited for a generic ****ty new forum look. At least this forum has character, which it probably won't after the update.
Hopefully they don't **** up signatures, but you know they will because [insert forum NeoGaf etc here] doesn't allow sigs.
Also, what about avatars? The complete control over what your avatar can be is really great, especially because it sits in an open area on the page. No silly border or **** like in most modern forums. Transparency actually matters. I highly suspect they will implement some form of crappy avatar scaling too so everyone's avatars will always be exactly the same size on every user, even if they uploaded a small image. No pixel-perfect avatars any more, just bilinearly scaled up or down to fit one generic square or circle shape like other forums. Boring.
I will miss the freedom dearly.