The QM2 has just finished a 25 day refurbishing in Hamburg dry dock . The QM2 now has 30 suites added on the top deck. There are also 15 more cabins (I believe geared for solo cruisers. 6 on deck two where the passenger photo gallery used to be. And 9 where the back half of the casino had been. I was surprised to see that the port terminal facility had been moved from Haven City (near downtown) to the new 3rd cruise terminal called Steinwerder which is next to the Bloom/Voss shipyard on the south side of the river to permit larger ships a better place to berth. It is still possible to take public transit (including a city ferry to cross the Elbe River) to the new terminal, but you will need to walk the last 1/2 mile on a new sidewalk, The new Steinwerder terminal was not well managed. It was probably the worse ship boarding I ever did.
Concerning the ship, the cafeteria area was re-configured. I think traffic flow was a little better than in the past. The crew was all new. The food was ok, but I think it had been better in the past. The dance floor in the queens room was completely replaced with new hard wood that made for good dancing. Lots of good speakers gave talks. The entertainment was good.
Hamburg is nice, good public transit and very bicycle friendly. Recommend riding a bicycle around the lake in Downtown Hamburg. The management of the new (for larger ships) Steinwerder cruise terminal is very bad. Had to wait 2.5 hours in a single queue (passengers were not assigned to groups upon entering terminal). Not enough chairs for everyone to sit. No free refreshments while waiting in line.