IMO, the colors have a psychological impact on my workouts. For instance, the covers of the DVDs in the Intensity series have dark colors, so when I choose those, I feel like "OK, this is going to be a tough grueling workout". The Body Blast series colors make me think "High energy workouts!" So if the covers of the new DVDs coincide with the disks, I can only imagine I'll think "OMG, this is going to be so much fun!"
Just my 2 cents!
Can't wait! Can't wait! Can't wait! Can't wait! Can't wait! :7