Manual audio!!! Faster RAW burst Rate!!! That they are updating the firmware 3 years down the line shows how much they love this camera and appreciate it's owners. Canon could have just told us to buy the 7D Mk II.
Rats! I bought Canon's TC-80N3 timer remote 3 days ago!!! I was pretty unhappy about having to pay so much for a function that could easily have been built into the cameras of the last few years. But I needed it, it is very useful & does what I expected. OK, I'm also unhappy that it doesn't work with my backup cameras (450D & 350D).
And maybe I don't want my smartphone hanging off of my camera in a public area. But using a smartphone to control the camera is very clever and will often be more practical than tethering it to a PC.