Define "launched." I think you're saying that they don't exist at all.
Envisioned, invented, tested, proven, prototyped, manufactured (many sub-steps here), marketed, and successfully sold all contain bits and pieces of the go to market process. These products clearly didn't get all the way through the lineup, but I doubt very seriously that they were put on hold before the even physically existed.
IMO the technology was similar for all of them, and the company had to pick one to focus on. So it picked one, with the intent of marketing the rest in the future.
