It has nothing to do with 8-bit vs 32-bit. The revo sends telemetry back to the ground, it has since the beginning. The problem is the Turnigy doesn't understand the LP telemetry format. Either the Turnigy or LP could be modified to make it work. To program for something like this the developer needs to have the device. A feature like this usually gets done when one of the developers buys the hardware and wants the feature. No one in an open source, non-profit project is likely to go out and buy a transmitter just to program a feature, it gets too expensive.
And the project is Open Source, if anyone wants a feature they can fork the project, make the changes, and submit them back to the project so everyone can use it.