It was reported earlier in the day that Missouri-to-the-SEC was official, then it was rumored that the school that will become the second-farthest-west team in the conference would join the East division. Those rumors have been confirmed as official, as Marc Weiszer from the Athens Banner-Herald reports the Arkansas' athletic director says it's so.
It's not too surprising a move, considering Missouri's fellow newcomer in the league, Texas A&M, is even farther west, and no original SEC teams were too keen on switching divisions. Though geographically speaking, this is puzzling, in every other way, this makes sense. It's not nearly as confusing as, say, Boise State joining the Big East.
The move will become effective July 1, 2012, at which point Missouri can expect to face South Carolina, Georgia, Vanderbilt, Tennessee, Kentucky and Florida on a yearly basis.