FSU has been rumored to the B1G for years now. If you look at what they're doing academically, it gives life to the rumors: B1G told FSU that their market and brand were attractive, but it would be hard to get the B1G Presidents to approve of the move because their academics did not align with the rest of the B1G. Lo and behold, FSU has been working hard to improve their academics and are setting up to apply to become an member of AAU.
Florida State University President Richard McCullough reflected on the remarkable achievements of the past year and said that he is filled with optimism
news.fsu.edu
He reaffirmed the university’s overarching goal to achieve recognition as one of the nation’s Top 15 public universities and make progress toward membership in the Association of American Universities (AAU). In September, U.S. News & World Report again ranked FSU No. 19 on its list of the top public universities, and McCullough said he is confident that the university will continue to rise.
There is a concerted effort by FSU the school and FSU the athletics program to join the B1G. There's a reason, of all the ACC teams, FSU is making the biggest stink about ACC revenue shares compared to the B1G and SEC. FSU knows they have an invite waiting, and they also know they're losing tens of millions, and soon be hundreds of millions by being in the ACC.
B1G also knows the state of Florida, along with the Southeast, will be a HUGE growth market. They understandably want a piece of it.