Good evening Baljit,
I have ordered the diesel S line subject to test drive although they are only allowing 20 mins max despite me requesting longer & ringing again separately. Myself and my late partner did however own a Q3 which I (we) absolutely loved, I found the height for access perfect and the boot space generous.
Personally for me I would worry more about the Q3 being removed completely rather than the black edition being added and would of assumed if they were to add the black edition it would of been added in Q2. I could be totally wrong and it may be worth asking a dealer for confirmation.
In regard to the hand control query, I think there is most likely a cost if you have them fitted after taking delivery but again I could be wrong ? hopefully someone with more knowledge will pop along and let you know.
Q3 – good choice, gorgeous car and I wish you many comfortable miles ?