While waiting for a proper German let me offer my take. I'm a bit unsure about the first sentence, but it could just be that it's not prepared for shipping. The rest I'm pretty sure is saying:
"How long this status remains for the order depends on the availability of the item and the selected shipping option."
Which kinda sounds like something you would say if just hasn't been prepared for shipping.
Oh wait, sorry, didn't see the "Vefügbarkeit" there !
It translates as :
We've got your order, but you shouldn't expect it to be shipped soon.
How long your order will remain in this status depends on the availability of the product and the chosen transportation option.
(Like Olof said)
Sound like there's some kinda of waiting list and they're sending it to the first ones that ordered. Probably didn't know it was a limited item.