The idea of having a female broadcaster before the game for the game intro is a good idea, MLB 2k used to do this. As well as singling out one player and talking about them before the game. MLB 2k had some good presentational aspects, including showing fans walking around the concourse before the game and entering the stadium.
I also really like the trivia question idea, you see that in a lot of broadcasts. Basically, the best course of action would be to watch a fox broadcast or sunday night baseball broadcast, basically one of the primetime games (any broadcast would be fine i guess) and try to emulate some of their presentation aspects. A female reporter or male (Ken Rosenthal does it a lot too), that can chime in at random points in the game, maybe make any mention of relevant things happening around the league.
As for presentation and commentary being the number one priority for MLB 17...*cough*player models *cough*