Yeah, in-camera HDR. Another feature found on the 5DIII (and other models, including my lowly PowerShot S100), but not found on the 1D X.
HDR, a little like Video, and a Camera you can hold to your ear and discuss the weather with to People a thousand miles away, all things I'm Happy not to see in a Camera. But that's just me, being me.
I have to say also, Thanks Neuro for the explanation on the Red Focus Point, I often wondered about this, having 2 1Dx Bodies and 2 5DMK III Bodies it intrigued me why Canon wouldn't have the same set up for this, but your Description makes sense, Thank You, and although it took some getting used to, I actually like the intermittent Red Focus point we now have in the 1Dx.
I Love CR in the morning (it's morning here in Singapore), in some immortal words from the Big Screen, "I Love the smell of Napalm in the Morning", and the Laughs, great stuff.