Kevin Harlan said on WHB today that the B1G is definitely going to 16, and probably to 20. Says he would not have gone public with this unless he had several reliable sources that he trusted 100%. Obviously, this is not some random blogger from WV, Harlan is real, respected media.
He also said that the Big 10 would like to add Kansas, but I'm a bit skeptical about that one, he may have been playing to his audience.
edit:
http://www.810whb.com/page.php?page_id=140, click on the Kevin Harlan link