Etihads 1st A330-300 is already in service operating the LHR flts. There 2nd one is due 27th i believe. They are in a 3 class layout so doubt you will see them in MAN on a regular basis. Think you will be stuck with the 2 class A330-200s for some time with the occasional visit of the 3 class 200s.
I do use the service many times and it is always very busy especially business class.
Shyted