It only seems to be issues with your device as mine and my buddies iPhone 6 Plus ( mine is a 6s Plus) and it shows LTE when I am on the phone. Here is proof. So it does work but hours seems not to work. ( I haven't seen anyone else complain yet with the new update).
Here is another image calling Rogers. It does work... The speeds are low as i don't live near a Rogers tower but right before the update, I used to get 3G and now I get LTE as u see on a phone call. If yours doesn't show LTE when on a call then maybe it's your device as mine shows it. I wont argue the fact if it does & does not work with you. On mine & my buddies it works so ill take that. I wont sit here & argue with you on if it works or not.
At the end of the day, Rogers released it & its starting to work. If yours did not get it with your family, then hopefully yours does & works!.