With regards to Rutgers, it sounds like a few things happened to spur the big 10s interest.
1) News Corp(who is a partner with Big 10) just bought a minority interest in the YES network.
2) Rutgers is about to get its medical program back which should improve its graduate school rankings.
That being said, I do think there is a possibility 14 is another school, or that its 14,15,16.