Big Changes in the Big 12?

Browsing CNN last night led me to this article about the Arkansas coach (whose name is Houston Nutt; insert humor here) forcing his players to wear pink when they goofed-off. The coaching team stopped this after people made some claims that the breast cancer support would be offended by this. Up to this point, the article is understandable. The article closes by stating that the coach is considering making players wear burnt orange as punishment in the future, since burnt orange is the color of Arkansas' rival: the University of Texas.

Wait a minute here; since when did UT's rival become Arkansas? What about Texas A&M or Oklahoma?!