For the PSP it could certainly include a webcast stream option, as well as perhaps being able to view other official footage and replays when games weren't on, ie. PBFashion stuff etc.
By far the best sports event app to date and one that should definitely be looked at for reference, is the 2011 official Rugby World Cup app. Freaking brilliant. I was able to sit in the stands at the game while watching live stats and text commentary on my phone!