As the official morrowind release date is 6th July you can still qualify for the "Discovery Pack" which is a bonus for pre-ordering. If you are interested into what comes with pre-order only (no collectors edition):
https://www.youtube.com/watch?v=eg6wLiWhHK4

Also if you want to see missing parts of Collectors Edition package like Morag Tong on all armor types (male/female) and Warden Bear skin:
https://www.youtube.com/watch?v=L0YwZwlyxmc