Most likely in late spring when it has warmed up enough. Exotic species face a very long journey from their hot countries and importing them when there is still a big chance of cold nights is too risky.
The trouble with exotic ants is that the weather has to be just right for shipping. During spring we had the unpredictabe snow and frosts that would be bad for exotics but now it has got to the point where the weather is some times too hot for shipping ants over long distances. Antstore will prob. only risk shipping ants in when the weather will be mild from the equator to Berlin. That could be next week or it could be in the autum.