It will be the next version of P90X. Apparently harder than the first one, but similar in format. Tony is currently doing One on Ones to develop MC2. Basically, each month a new workout (a One on One in his home gym) comes out with new ideas that focus on the same format as P90X. So, for example, he took his Chest & Back workout from P90X and developed Chest, Back & Balls showing you different moves to work those body parts (with the addition of the stability ball, maybe a medicine ball too, not sure). I love Tony, and will buy MC2, however, the One on Ones to me seem like a rough draft...so why buy both????