I just got a mail from amazon.de regarding the change of the pic:
Good Day,
here is an important message about your order from Amazon.de.
In this order you ordered th article'Pirates of the Caribbean 1-4 Collection [Blu-ray]' (ASIN B005GNQTWE)
At the time of your order due to incorrect manufacturer's specifications this article was mistakenly listed as "Special Edition" with a treasure chest depicted on our website -
in reality this edition is without the treasure chest.
The catalog entry has been corrected since then. We apologize for this error.
The originally ordered item will soon be available to preorder with another ASIN.
You will be informed about these in the next days. Please be patient and do not cancel your original order for the time being.
We are currently working on a satisfactory solution for you.
Thank you for your understanding.
So it seems the treasure chest version will ge a little bit more expensive and everyone who allready preorderd it will get it a little cheaper. We will see