What I seemed to gather from work tonight is that most people probably won't be able to watch it on ESPN3. I could not watch the Toledo-Western Michigan game. It showed up in some places and not in others, but if you did click on it, it said something about your service provider having to be contracted with ESPNU. I was signed into ESPN3 remotely with my home Internet and I get ESPNU at home but I still was not able to get it.
This would be the WatchESPN platform I was discussing, which they are melding into a unified interface with ESPN3 to some extent lately. To authorize for it, you have to jump through some hoops with your
television provider as opposed to your ISP (even though, yes, they're probably the same company). The number of providers is fairly limited at this point, as the service is relatively new, and this is the kind of thing that gets added in carriage agreements that are only negotiated every handful of years. The one company of note to this audience (and, based on your location, I would assume to you) that had an agreement for the service is Time Warner Cable.
Essentially, WatchESPN allows you to stream the linear networks online (E1, E2, EU, GoalLine/BuzzerBeater) that you have access to through your cable package.