According to Microsoft’s Devices Blog, the previous eleven stops on the tour were fully booked within ninety minutes, hence the extended instillation in NYC, which is planned to stay open indefinitely.
Microsoft hopes that its flagship store’s experience will attract new developers to the device; interested parties can register to request an appointment to demo HoloLens at Microsoft’s HoloLens event page.
See Also: Watch Halo 5 Played on Microsoft HoloLens in Augmented Reality
The HoloLens Development Edition will begin shipping in the first quarter of 2016; application prerequisites, details and other information (e.g., the $3000 price tag and two unit limit per application) are available here.