Does anyone know if there is any camera including the new Mark iii/6D have the capability of recording video to more card at one time? Or stream wirelessly video to any device? It seems like the video technology is lacking in this area and although they have this for photo, it would be MUCH more beneficial to have this for video and would provide much safer results for the uninsured videographers.

The XF105/305 & the C300 have the ability to record video simultaneously to both compact flash cards.

The FS700 can record to its optional internal memory module and a SD card at the same time.

Wireless options exist but are extremely pricy and require licenses. They are not practical for modest budget productions.

You can get a SD card with wifi transfer built in as well. It works good for photos. It is too slow to keep up with video if you are shooting constantly.