sorry to join into the late discussion. I've been playing for a while now. I bought my game from an UK website called Gamesplanet, i've asked them about Heavensward preorder and this is their reply:

"We are still waiting for the official preorder start to be announced by Square for digital distribution. They have just announced the preorder for digital partners will start soon, but there were no further details communicated so far."

I've tried to use VPN to buy from the UK SE store but to no avail. Seems like the region lock is very tight. I guess the only option now is wait for Gamesplanet or get from Qusahn...? I wonder if their version has the early access thingy... sigh