I remember when Jim Rome was mocking the edited dialogue of the OG films in this case DH2 (Yippi Ki Yay Mr. Falcon) and one of the producers of the films called the show, long story short they started to talk about the new film they were thinking about and how it was going to revolve around John McClane's son and Patrick Stewart in some way. Never heard anything about it being in production or post production and now it's about to come out, that shyt confused the hell out of me.
In contrast I have no interest in the new Robocop film that's coming out soon and the whole new Robo suit and hand incident made it's way to me and I wasn't even checking for anything Robocop related. I love the Die Hard films and checked the IMDB page every now and then and have heard nothing about it.