Found some iOS 11.1 release notes here.
I don't think carriers make their carrier-specific OTA update release notes publicly available. My guess is that it'd be standard carrier adjustments to the iOS updates. I don't use an iPhone myself, but am aware that they have some sort of carrier integration. If I'm not mistaken, if you were to unlock the iPhone and use it with another carrier, you'd see that carrier's integration version number in the phone.
For more practical applications, we'd have to wait on Koodo to announce VoWiFi/VoLTE or any other carrier-driven features on the iPhone.
From my experiences, each new ios update will have new carrier update, but Carriers could provide themselves many small updates for extra functions like Robert mentioned (WifiCalling...).