UCLA (and USC) have announced their intent to leave the Pac 12 to join the Big Ten for the 2024-2025 season.  Although certain sports will not join the Big Ten, gymnastics will shift to the newly expanded Big Ten.  Sports media experts say the move is spurred by the attraction of a share of a larger TV contract, driven by football  Over the last several years, the SEC and Big Ten have driven to separate themselves from the rest of the conference through expansion and their successful TV networks.  This shift is not over, with football (and to a lesser extent, basketball) and media markets/fan base driving the way, and we may see further realignment as schools act to preserve their interests.  The latest updated reports indicate that the Pac 12 10 is exploring expansion options, and that the Big 10 has told possible inquiries from Pac 12 members that it is holding off, for now, even as they actively pursue Notre Dame.  

Link:  UCLA Release

Link:  CBS Sports Update