"but why in the hell do they get already 700 orders after 1 month of sale "
Because if you ran a flying school you would have people lining up to learn in it and to rent it. Be honest... faced with a clapped out 150 / 152 / PA28/ Skycatcher... wouldn't you?
"By the same token I doubt that we will ever see the Skycatcher in Europe. "
I'd buy one tomorrow and rent it back to a school. (looks up Cessna phone number)