With the Workout Blender you could probably create somthing similar to Intensity, but I recently noticed that CTX - Step Intervals (the cardio part) is almost similar in format as the step portion in Intensity. You could add some Hiit to the end. Step Intervals is not as hard as Intensity, but you do a stpe portion and then some interval blasts. It's about 30 minutes, tack on some of Cathe's hardcore Hiit stuff (40/20, 30/30, or DWP) and that would increase the intensity.
I love the step portion in SJP too, it's a bit like Intensity in the beginning.
I think we need an Intensity 2 soon!!