As noted, exact time will be announced, as well as television coverage...which I assume will be handled by the Big Ten Network. No other specifics were announced in terms of how much an actual "game" this spring game will be...but I suspect we'll hear more as spring practice progresses.
The April 1st spring game will give Michigan football players a full 19 days between the end of spring practice and final exams. However, unpredictable Michigan spring weather could have a dramatic impact on this event, especially after the sun goes down.