WiFi functionality with an improved Android and Apple App would be great. It could also use the geo-information from the phone to tag the location when connected. For landscape shots from a tripod, you could use the phone as a remote control, including timelapse and bulb shots longer than 30 seconds. For some of the photographers in the news business, or social media addicts, one could quickly post and send jpegs from the phone to instagram, facebook and alike, or classic e-mail.
All in all this should be an easy fix and software upgrade for Canon and I wonder why they did not do this 3 years before. The last time I used the Android Canon Remote App with a Canon 6D about 2 years ago, the phone app was very early and basic in functionality. I did not use it much therefore, but this is certainly something that could be really nice.