Kailh 1442 switches have a scissor design, which is similar to, but not identical to, the (as yet unreleased) 1425 series. (You're reading that correctly: Kaihua is working on two separate low-profile mechanical scissor switches.) That's unique enough, but the other compelling part of the design is the light pipe;
These 1442-series switches, then, are notable for multiple reasons: They're low profile (apparently a growing trend), have a scissor design, and use a light pipe. The fact that prototypes now exist--at Computex, remember, there were no prototypes to be seen on the show floor--means that Kaihua has now at least taken one step closer to turning them into a Real Thing.