From PocketWizard:
MiniTT1 & FlexTT5 for CANON
TTL support for the 1D X, 6D, 70D – Beta Version 6.686
A major breakthrough in firmware development has enabled full TTL compatibility with modern mid- and high-end Canon cameras: the Canon EOS-1D X, 6D, and 70D are now fully supported on the ControlTL platform. Future cameras will be added *much* more quickly as a result of this breakthrough. Please help us put this firmware through its paces, and tell us what you find. Click here for Canon 6.686 release notes.
MiniTT1 & FlexTT5 for NIKON
COMING SOON! Support for the latest mid- and high-end Nikon cameras such as the D4s, D610, Df, and D7100 will be ready for public beta testing soon. Watch our Facebook and Twitter feeds for the announcement.
The current OFFICIAL firmware release for MiniTT1 & FlexTT5 for Nikon is 3.400 and instructions for downloading the firmware can be found here. Click here for Nikon 3.400 release notes.
Relevant Link: Guide for Installing Beta Firmware with the PocketWizard Utility
B&H carries the PocketWizard MiniTT1 and FlexTT5 radio triggers. (thanks Eric)