The 330 fleet is split into low density (more business class seats) and high density layouts. Although scheduled to receive a high density version, I understand NCL gets a low density version about 25% of the time - don't know if this is down to demand for business class seats (which would be a good thing!) or other operational reasons.
And in answer to the original questions, if there is a time scale for EK to upgrade the route from NCL, nothing has been made public.