Where/How to Pre-Order Heavensward

[Lexia]

Does anyone know for sure whether the digital CE for Windows will be a Square-Enix Store exclusive, or will it be available anywhere?

Also, has Square clarified whether those of us who play on multiple platforms (PC and PS3 in my case) will need to buy only one copy of Heavensward, or one for each platform? Thanks.

from the live letter

I play on both Windows and PS4. What do I need to purchase?
You will need to purchase both the Windows and PS4 versions of the expansion to play the new content on both platforms. If you would like the exclusive bonus items from the Collector's Edition, you can get them with either the Windows or PS4 version as they will be linked to a single service account. Heavensward must be installed on the client to access the areas that will be added in Heavensward. If you are planning to log back in on a client that doesn't have Heavensward installed, make sure to log out in an FFXIV: ARR area.

[Ryuukishi]

from the live letter

Thank you.