I'd love to see a mix-and-match Tabata DVD with numerous exercises included, that can be combined in groups of two to make "20-second-on, all-out-effort, 10-seconds rest x 8 = 4 minutes", "true" Tabata workouts that we can change up every time we do them.
Something with a menu that allows us to choose two exercise combos from a list of maybe 12 options (ie: squat jumps + jump lunges).
Also showing lower-impact mods for any ultra-high-impact moves (like air jacks) that are included (though ideally sticking with moderate-impact and perhaps adding in a med ball to add intensity without adding impact).