I didn’t get any photos of it because I didn’t see it in action in the exhibition hall but there was a quick look at wireless control of the Canon C300 on an iPad. According to the brochure I picked up this is accomplished with the WFT-E6A Wireless Transmitter.
The EOS C300 and C300 PL come preconfigured so that camera settings can be viewed and securely controlled on third-party devices with common web browsers….With the WFT-E6A module, the camera can be controlled from up to 150 feet away over an 80211b/g/n/z wireless network. The WFT-E6A lets you start and stop recording and also adjust focus, white balance, gain and other parameters as well as adjust the aperture of Canon EF lenses.
This is going to be a handy tool for filmmakers.