While time will ultimately tell, it certainly appears as if these follow in the footsteps of Nightforce's hard use lineage. It has the look and feel of an NXS. I would not consider the SHV line that they make to be hard use, it is a recreational product. I saw one of the press releases for the NX8; it looks to be the start of a new 8x zoom family.
Nightforce typically develops for military requirements and it just so happens that the S-VPS (Squad-Variable Power Scope) solicitation (RFP) is posted by USSOCOM on FBO. Requirement is for a First Focal Plane and a Second Focal Plane LPV. Must be unity on 1x with a min of 6x on the high end.
There has been buzz of these scopes getting passed around the SF community for about 2 years now and they are just now hitting the commercial market.