Middle school and Elementary schools playing together?

Will middle school and elementary school teams be playing in matches together and then have some awards for middle school, others for elementary school and others like teamwork for the best alliance no matter if they are middle or elementary? Or are middle playing with middle school only? and elementary with elementary only?

An Elementary and Middle School division has been established for VEX IQ at the World Championship. Teams will play only with those teams included in their division. Division, as well as overall award recipients will be recognized at the World Championship. Details are available on the “Awards” tab for the event on RobotEvents.com: http://www.robotevents.com/robot-competitions/vex-iq-challenge/2014-vex-iq-challenge-world-championship.html