Does anyone know if Sram 11 speed derailleurs will work with a 10 speed shifter/cassette set up? The 11 speed derailleurs seem to be more available and cheaper for some reason. Same also applies to the yaw front mech, will 11 speed work on a 10 speed(FSA) chainset?

No, different sadly.

Okay, thanks njee, that saved a potentially expensive mistake.

Confusingly though, the new CX1 group is cross compatible!

Strange, makes me think the compatability stories are all made up, I’ve just gone for a 10 speed force rear and a 22 yaw front mech, hopefully should all work well with the 2012 red shifters.