After going back and forth with Terry a little bit, I think you as a IN subscriber will be able to access On3 team sites as long as that team doesn't have a Rivals site. So for Nebraska, which has both, you will still be limited to Inside Nebraska and not be able to access HuskerOnline.
You will also have access to On3 National stuff (from Fong, Staples, etc), but you will not be able to access articles written by the local On3 staff, HuskerOnline.
That's the way I read it.
What this boils down to, apparently, is that there really won't be any change. The benefits of the merger will be you being able to access sites for teams you are not a fan of and national articles from both networks. Which to me... pretty meh. If you want access to both HuskerOnline and Inside Nebraska, you will still have to have two separate subscriptions, though Terry said they may offer a discounted sub in the future for people who do both.