Fairphone intend on releasing all the relevant source codes for the BSP which will be great when we see it.
This should allow just about any android based OS to be run on it, once porting work is done.
ie.
- Android systems like Cyanogenmod and Replicant.
- Weird hybrids like FirefoxOS
- Hybris based systems like SailfishOS, Ubuntu Touch, LuneOS (WebOS), and Plasma Mobile.
Sure there is a lot of work to be done to enable all of that, but once the source code is released then Fairphone have done their bit and its up to the various communities to support the device.
but this discussion probably belongs here