Rotation lost? I don't get that leh... When you rotate the crop rectangle, after cropping, CS would actually rotate the image back to the nearest orientation (i.e. portrait or landscape only).
For example, you have an A4 image, and your crop rectangle is A5 size. You rotate it clockwise to 45 degrees or more, the end result would be a A5 landscape orientation. Likewise, lesser than 45 degrees would give you A5 portrait.