Just uploaded v2.0p to the repo. The changes are in the readme. The big one is that the 3D renderer and geometry engine are much faster than the previous version. There's still more optimization work to be done, but this is probably the biggest shift you'll see in a version release.
My 1GHz Pandora arrived today, and I was surprised to find that all of my test set that used 3D was 12% faster at the same clock speed (900MHz on 1GHz unit vs 900MHz on my original CC unit). Overclocking that to 1.15GHz made an even bigger difference. So for people using CC or Rebirth units, all I can really say is that there's a lot of extra potential to be had in upgrading to a 1GHz if you're willing to take the plunge.
Since this version changes a lot of code it may be best to start the compatibility list over again, archiving the old one. Since this is an x.0.0 release consider it more experimental and potentially more broken. It's my intention to focus again on compatibility fixes and features until the next major revision (3.0.0), like I did last time.