I'd love to know as well.
As far as suggestions, as much as I love STS I don't think I would have space for all those DVDs again. With the exception of the newer workouts, I have all of Cathe's DVDs and I do at least 1 Xtrain workout per week every week. I use all the Xtrain DVDs all the time, so I would definitely love something similar. However, I have to agree with everybody that is asking for something new. Cathe, I have been working out with you since the 90s and you introduced me to so many new and challenging workout styles: Circuit training, Interval training, HIIT and Tabata, Barre workouts, Bootcamp, 100 Rep Challenges, etc. You are not one to follow trends if they are not effective or if they might compromise safety (for example BOSU, kettlebells, trampolines, which are effective but can be unsafe for some). Mixing the best of what we already know with something new would be great. I like what you've done with the last two Rock Bottoms Rotations with the BBW, where we do a challenging strength workout for a minute followed by plyo for 20 seconds and I read an article on your newsletter a couple of months ago about this style of workout as well, something for you to consider perhaps?
I will probably love anything you do anyway, but I thought I should add my two cents to the discussion. Thank you.