Edited to account for a follow up question answered by Javan
Received an email back from Javan Hedlund, the Mountain West associate commissioner in charge of football communications. Two items from his email:
* There will be five games exclusive to the MWDN.
* The ROOT Sports games will be streamed.
If you are considered to be in-market for ROOT Sports, you will only be able to view the games on television. The online stream is specifically for out-of-market viewers.
As for the five exclusive, I would guess right now that they could be a mix of conference & non-conference games.
With five exclusives, plus the ten ROOT games and 44 telecasts split between CBS Sports Network and ESPN, expect there to be additional coexists between regional TV and the MWDN. Nevada announced that their home game vs. Hawai'i would be televised on the island on PPV and available via the MWDN, so more regional TV & online coexists could be forthcoming.