Again, quoting Chip Brown's twitter:
Texas will announce its plans to join the Pac-10 after its regents meet next Tuesday, source confirm to Orangebloods.com.
How is that fluid? They either made the decision to go Pac-10 or they didn't. He never reported that they were considering leaving, or in discussions, or would leave if A&M did. He said they were gone.
If you want credit for breaking big stories, you have to own it when you flub something. CB was either misled or misinformed at that particular stage in the process, and if I were him I'd think seriously about whom I should trust. Unless of course he just wants to pass along threats from the UT athletic department to get the rest of the schools to capitulate. Look objectively at his twitter account and tell me what seems most likely to you.