However, looking at news stories, there will be no divisions and the 2 best teams in terms of percentage will go to the ACC Championship game.
It's possible that an ACC school that doesn't have to play Clemson could have a better record than the winner of the ND/Clemson game (assuming the winner goes undefeated). It also seems likely that multiple teams could end up with 1 loss, which is unclear how that would be resolved.
at least one of the two conference championship game participants will have 2 or more losses. I would actually put the odds of having two 10-0 teams, a 10-0 and a 9-1 team, or two 9-1 teams in the conference championship game pretty low. If forced to make a wager, I'd probably wager on ND going 8-2 in conference and still making the championship game.
Just taking a look at last year, Big XII and PAC-12 had two 1-loss teams in conference with a 9-game conference schedule. The SEC had an undefeated and 1-loss team with an 8-game conference schedule.
It's possible the extra game or two in conference could change that. I guess we will just have to wait and see, assuming college football is played at all...