In the last 2 years ESPN has kept 2-3 games in limbo with regard to tipoff time because one of them is going to designated their primetime game. The Miami game is that situation. Indiana-Mich St and one other game are also currently TBA for the 21st. They usually don't announce which game is the prime game (and the times for all the options until the Saturday before.
It is not optimal but like with the ACC football schedule times is the price we pay to have (nearly) all of our games televised in some fashion by ESPN.