Its likely they'll stagger housing release for the new data center to a later time after the data center opens, they did it with newly added servers in EU anyway. As for regular servers ishgard housing zone will release with EW launch, but houses won't be open for purchasing till a later time, also likely 6.1ish. They also plan on having some come with a new lottery system, think theyre planning on testing 1st with just a few wards.