I'm very excited for IMAX 4!!! I like that the blasts will be low impact. I enjoy her low impact, it gets my heart rate up.
Maybe the PHA Step workout will be in a similar format as the "PHA Plus Cardio Blasts" that she did for Cathe Live in February. It alternated lower, upper, and a cardio blast. I hope it uses dumbbells for upper and lower so the premixes will be total body weights.
I'll probably only be using the "intermediate" step workout on the STEPsync dvd (I'm a klutz on the step) but it'll still be fun, I'm sure.