PocketWizard ControlTL MiniTT1 & FlexTT5 6.104 Beta for Canon is now available for download
The release notes can be found here here.
According to Rob Galbraith, the new beta "adds support for the Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT."
Rob also adds that "... this beta firmware release does not add compatibility with the Canon EOS 5D Mark III, EOS-1D X or EOS Rebel T4i" and quotes LPA Design's statement that the "5D Mark III is being reverse engineered and is our highest firmware priority."