It's high demand due to low capacity in those locations, plus remember that there's more than just Star Wars. SoCal has yet to get Ghostbusters, for example. I'm very surprised that San Fran, Seattle and Chicago have yet to be pinned but The VOID is planning on a huge expansion soon so this could be just the tip of the iceberg. Officially the location opening dates are TBD but I would expect most of them (if not all) to open sometime in 2019.
BTW the full location list is: Atlanta, Austin, Dallas, Hollywood, Minneapolis, New York, Philadelphia, Santa Monica and Washington, D.C. NYC will be a permanent location unlike the current Madame Tussaud's setup, and Minneapolis is... uh well, I can't say it but it's not hard to guess where it'll go.
Also expect another announcement from The VOID very, very soon!