Mike doesn't patrol RCU much anymore but I'm all over the place.
I totally get the need for more channels, especially as someone who flies GS. 9 channels is the limitation with our system and that's pretty much how many servos a lot of 35% airplanes have, mine including. I have overcome this problem using a pair of Maxima 9 receivers with my 9X since 9 servos leaves you with no room to plug in power.
There has been rumors and speculation of a higher channel transmitter coming out soon but I don't have any other information available to give out. There are shortcuts and methods to bypass the 9 channel limits (ganging servos on the same channel, using channel expansion systems, etc.) in the meantime.