Those discs are fake. They have been floating around for a couple months...No company wanting to make a profit would sell region-less discs. Someone probably just downloaded the eps from the internet, made some cheap menus and voila. Tough luck
The thing I don't understand is why would they release S4 THREE WEEKS after the start of S5? One of the advantages of releasing the previous season before the start(like 2-3)of the next is that it re-energizes you for the upcoming one.