Very simple. Pro is the latest device which arrived. I personally like it very much. But the Pro was the latest device we received, so we have still some issues to work out before we pull the trigger on CM-Server. Also it is still not available in many shops for example. Here in Germany it's hard to find (except online) and because of that it's not very popilar now. Release was only a few weks ago, a little patience please here
At all the device is ready on github/cyanogen, it's named iyokan.
No need to worry, let us workout the latest problems and it will be included in official CM soon.