Quick play with it tonight
Took a little while to setup the WIFI, but once done it's easy.
Connect to Smartphone, it takes about 30secs for phone to see the camera.
Then you are greeted with 2 options:
Remote shooting
Remote control of camera work in either Live view or normal
Live view mode is default, in settings you can disable this.
I find live view easier to use via WIFI than on camera oddly enough.
Taking a picture and AF (once enabled on phone) is very easy.
Camera setting via the phone is not, have not found a way to change anything other than ISO and bracketing
Camera Image viewing
Picture viewing over phone is a waste unless you have a tablet or some device with a large LCD
4.3" phone shows no better picture than the camera can.
Print via WIFI printer, I'll probably never use, I doubt I'll ever take a printer with me on holiday
Transfer images between camera's another feature I'll probably never be using
Uploading to webservice another feature I'll never use.
View images from DLNA devices is great
Had camera in Office, logged into WLAN router.
TV (Sony Bravia) in lounge (wired in to LAN) happily saw the camera as device to show picture off.
Was able to use TV remote to browse pictures on the camera, quite neat I thought, but I'll probably rarely use this.
Pictures are grouped into 100's not folders as on the SD card.
All the above eats battery life
There you have it.
Other nwe feature the 6D has is GPS, and again never used it yet.
If I forget where a picture is, I probably shouldn't have taken it