The current scoreboard at Michigan Stadium just doesn't have a small screen but it is pretty faded from the inside. I would even be cool with them leaving them the same size and just making the entire upper part a screen.
I'm more excited about the fact Yost will have a video screen. Now they can show replays on goals which only the people behind the penalty box can see. This may be a stretch but I think a real screen would add to the home ice advantage when it comes to penalties. Sometimes the refs miss a penalty (ha ha!) but when you show it on the screen maybe you get a call to go your way later on?