A four-pod system with four teams each seems likely once OK and TX are fully in. I'd actually been thinking about this earlier today and came up with what I thought would be the best arrangement of teams in each pod based on competitive balance, traditional rivalries, and geography, only to find that SI and just about every other source I looked at afterwards had come to the same exact arrangements. Oh well, great minds of course.

Anyway....
Oklahoma, Texas, Arkansas, Missouri
LSU, Texas A&M, Ole Miss, Mississippi State
Alabama, Auburn, Tennessee, Vanderbilt
Florida, Georgia, Kentucky, South Carolina
That puts at least two traditional and/or recent powerhouses in each pod.
Every team plays each of its other pod members every year. Inter-pod games could be scheduled in a number of different ways. You could have a traditional rival in each of the other pods that you play every year, and then play the other 3 teams on a rotating basis, or you could do away with traditional inter-pod rivalries and play all the teams from each pod on a rotating basis so that you face each team in the conference every 2-3 years, depending on how you do the rotation. About the only rivalry issue I see here is that TX & TAMU and Auburn & UGA, two traditional rivalries, would no longer be annual events.