"in promeande you are going neither where you are looking nor where your feet are pointing (unless you are looking or pointing to open).
You should be moving in a direction substantially inside both."
Sorry all, I hadn't had my coffee when I posted that and it's rather backwards as a result. What I mean to say is that feet are likely to be pointing somewhat inside the actual track of motion in promenade - if you turn your feet all the way out to the intendended direction, most people will move on divergent paths. Officially the feet are 45 degrees in from the direction of movement - you can point them close to it, but not to the point where you open your body or move on divergent paths.
Speaking of opening the body... there's really not much point to doing so until you have to. Open the head, and point the feet in the new direction and you are fine. The hips open some, but the topline must stay closed. Many rotate their hips out to bring the back leg forward for the step through, but unless you are turning away from that leg (easy to identify as your partner is using CBM) you really shouldn't, if anything you should rotate your hips slightly closed towards your partner as you move the whole body side and slightly forward to take a step of the inside leg. This is afterall the step that results in the most pronounced CBMP - forward AND across.