Slight disruptions have occurred already:

EK029/030 DXB-LHR was supposed to go from 777-300ER to A380 in January, however it was switched back to 777-300ER just before the A380 was put on the route. The return of this was originally slated to begin March 1st, but yet once again has been delayed until March 30th or 31st (Can’t remember which date!).
EK322/323 DXB-ICN was A380 but has been switched to the 777-300ER for the time being to accommodate the checks.

However I'm sure some will be glad to know that Emirates has still kept plans to operate EK005/005 DXB-LHR as an A380 from March 25th, despite the fact that EK029/030 was supposed to become an A380 before this flight!