If they started over and built it from scratch, I'll bet that would be a 12-18 month process .... if not longer. Anything shown in Dish videos (like the one linked above) could be fake or a simulation. Scott did a video with a Dish rep and the rep actually was in control. Was that the rewritten-from-scratch version or the "wrapper" version ? If it was the wrapper version and Dish started over after that, well, that's pretty hard to believe.Initially the new UI was just a new visual wrapper around the existing system core. And then they decided to scrap that idea and build it from scratch.
Who knows when that was and how far along they are in the group up development?
If the new UI is really being tested in the wild, but only by Dish employees at this point, it has to be pretty damn close to production-ready. Your everyday Dish employees aren't software engineers (no offense intended at all) that will do hard-code, thorough testing. The reason they are testing is a) it can be a reasonably sized group and b) they can "control" information that may be disclosed (with threat of losing one's job!).