987 is one of the alpha test teams and so far the new control system is great. It's a little bit easier to understand, and its designed specifically for FRC. IIRC, the cRio was used for crash testing before it found a use in FRC.
We just received Rev C. of the new main board and it looks awesome. Everything is a lot more compact and user-friendly.
The PDB they gave us looks quite a bit smaller than the current ones, but it also doesn't have a case/shell on it. The dimensions I could give you would be useless because it will change, but as of right now I would say it is going to be smaller than the current one.
I'm pretty sure we can post pictures of it because we had to display it at the regional events we attended. I'll see if I can get our programmer to upload some later if he can. After a quick Google search you can see renders of the new Rio in its case, but no specs that I'm aware of.
Looks like The Fighting Pi has pictures and stuff up on their website about the new control system
here.
I believe I read something about them adding more teams for Beta testing, but I might be wrong about that. Don't hold me to it.