Along with the 5D Mark III just announced, Canon announced a new speedlight, the 600EX-RT. The 600EX-RT is Canon's first speedlight to introduce a wireless radio capable of communicating with up to 15 other units at a range of 30m. Just as impressively, the flash features the same weatherproofing standard as Canon's flagship 1D X. Pre-Order the new speedlight at B&H.
The 600EX-RT, which serves as a transmitter itself, is compatible with a new dedicated speedlight transmitter also released today, the ST-E3-RT. For the price, it may still be worth looking into the arguably more capable PocketWizard Plus III units, but having these options in a new, top-end Canon speedlight will be more than welcome for Canon shooters looking for a more robust system.