OP is the main project, the one that started 18 months ago and consists of GPS INS and mainboard. There are about 10 sets flying.
CC is a side fun project that is growing.
The advantage for the project is that the code work used in CC can instantly be ported to the main platform. The big platform is more than most people will ever need. CC will eventually support everything that most users here need.
SLAM is already working with the mainboard
http://forums.openpilot.org/topic/3216-slam-solution-flies-with-op/
I am seeing shouts of vapourware everywhere and its just plain nonsense. We have gone quieter with our hardware because it is being ripped off instantly. Files are there if you want to make your own, but the licence does not allow anyone else to make and sell the hardware.
Without people buying from the project with the tiny margin we put on we can't pay for extra stuff for developers to make it cooler still.
The mag baro for instance, test hardware is made but a couple more developers would be great to help bring it alive!
There really needs to be enough demand for it to make it worth bothering doing.