The old CoM will have some incompatibilities with the new HARP Fantasy. However, we expect to make the same sort of arrangement with CoM as we have done for HARP Fantasy, i.e. a time-limited discount so that you can update to the enhanced version.
The monster chapters of Something Wicked (and there are almost as many monsters in Something Wicked manuscript as there were in the old Monsters: A field Guide) are moving out of Something Wicked and at least two chapters are moving into the new HARP Bestiary. The Mystic, which was originally written (by me) for College of Magics but got cut from the original College of Magics for space reasons, will be moving into Something Wicked instead.
Best wishes,
Nicholas