Actually the rule is that you can't take liquids through security - when you have passed through and are in the air-side shopping mall you can buy as much as you like to take on board
But - this thread has gotten way off topic.............
So, to get it back on track again, I have heard that a batch of HD 800 will be released from the factory in a few days and shortly after that the local Sennheiser distributors will know when to expect their first shipments.