I'm pretty sure the manager said Hanover, but I could be wrong. I know we fly to Hamburg too. These are training flights for the crews to gain some line experience. The sectors are long enough for there to be training value for line training. As already said, they are replacing regular A32X services, so limited sales tickets, just in case there is a hiccup, and they don't have to send 3 A32X's to pick up stranded passengers in case there is a technical problem, or some other issue to prevent the 380 operating.
There will be a few other destinations. At first, base training will be at UK airfields. As I said, I'm pretty sure it was Hanover, but if I'm wrong, it was definitely in Germany with an H!