I actually have said this to friends...imagine all the reworking of contracts/legal stuff as this continues to emerge/change.
My guess is the contracts will be paid out on a pro-rata basis of the current contract depending on the number of games played. That shouldn't involve too much detail. Maybe under the idea of the Big 12 adding two team they get a pro-rata addition not any increases.
If ESPN or FOX were strongly encouraging play this season it might bring the Big 12 some good will in upcoming tv contracts. Possibly the ESPN+ deal with ESPN in the future.
The hard thing to figure out with ESPN was do they want a season? You would assume they do financially but they are so politically motivated, one might wonder.