Wow, this is great news! I think you'll be reaching lots of new folks with these workouts, and that's wonderful for them..and for you!
Anyway, since the DVD format allows for so much variety, I was wondering if you might consider including an instructional segment for those unfamiliar with your choreography and style like Christi Taylor has done with the "Move Master" on her more recent high/low and step workouts (it worked especially well in the "Solid Gold" series last year.) Some folks didn't like it much, but I thought it was helpful--expecially for the more complicated combos.
In the Move Master segment, Christi cues and shows the moves with her back to the camera. Christi shows the more complicated options as a second exerciser shows less advanced modifications. It helps less experienced users practice some before bringing it up to speed in the regular workout. Including such an instructional piece (can't call it "Move Master" since the name is trademarked, but I'm sure you could do the same sort of thing and could call it something else...)can meet the needs of beginner/intermediate exercisers and allow you to kick the actual workout up a notch or two for everybody else. This would give uninitiated Cathe-ites something to really work for, and would help keep your regular educated crowd happy!
Otherwise, for the extra 30 minutes of time on the advanced level DVD, I love the "IMAX 2 1/2" idea--especially if you can include all cardio, all upper body, all lower body, and all-core premixes pulled from the other material on the DVD. I'd also welcome an all-floorwork routine and an extended athletic stretch segment.
But, as others have noted, you have great judgement! I'd be tickled pink and ready to buy anything you decide to do. Thanks for asking!
Laura