RE: Futaba 14MZ, 12Z, or 12FGA?
I'm not so sure that the 12FG is going to be a dedicated 2.4 GHz TX (or as you put it, purpose built). From everything I have read about the new 12FG, it sounds like it may have the same replaceable module that the 12Z and 14MZ have. This means that it will not be any different than the 12Z and 14MZ as far as modules and frequency transmission goes. It sounds like all 3 TX's will be able to transmit on the different frequencies available just by swapping out the module.
I hope this also means that the 12Z and 14MZ will be available for purchase with whichever module you prefer it to come with.
I'm still waiting on clarification of this, and I will be at the Futaba booth this weekend at the Toledo show asking a lot of questions. Hopefully they will have some answers.
Jim