A lack of release date doesn't mean a release isn't anywhere close. It could be coming within the next few months, all depending on how quickly progress is made. Remember: time =/= quality; there's absolutely no true relation. A man can paint a masterpiece in a few minutes while another paints a piece of shit over the span of several years. Same with books, same with movies, same with music, same with anything. As long as everything goes well and there's minimal interruptions, Bannerlord can come out pretty quickly.
That said, don't get too hung up on these games. There's plenty of amazing games out there and you're robbing yourself of them by focusing on NW, BCoF, Bannerlord, WoR, etc.