While the FNP-45 predated the FNP-9, FNP-40, and FN-357 (.357 SIG) in design, the .45 AUTO was actually released to the public last. The smaller calibers were redesigned a few years later to have a grip texture and shape more like the FNP-45 and branded these as FNX pistols. So changing the name of the .45 to FNX is a welcome change for some branding consistency.
The Trijicon RMR shown is the dual illuminated model RM04. This model uses ambient light via fiber optics, when a light source is available, and radioactive tritium when it isn’t. While this model doesn’t require batteries, it is not as bright as the LED models. Life is full of compromises.