The four that would have been in, this year were (likely)
Alabama
Auburn
Florida State
Michigan State
Next year it will be (almost solely due to how the schedules work out and the likely initial rankings next year)
SEC Winner
next highest ranked SEC team
Florida State
*
IMHO there is really only one open slot. In order the likely candidates are: Winner of the Big 10, Pac 12, Big 12, Undefeated non BCS school which has been successfull lately.