GM is allocating the limited number of vehicles where they will do the most good : places where they get CARB/ZEV credits.
I think (my opinion) that they are starting slow and slowly ramping up production to get all the bugs worked out. Who wants to recall 45,000 cars for updates/upgrades? Considering the complaints about the seats (same people sitting in 7 different cars will find 2-4 seats OK, 1 or 2 fantastic, and 1-4 crappy) it appears to be a good thing that the car is being rolled out slowly.
Since GM has sold Opel, I would guess that the absolute smallest number of Ampera-e vehicles that they can get away with contractually will be delivered to Europe.