To be honest, I'm not in a lot of fandoms at the moment. There haven't been a lot of tv shows that interest me for a while, and when I watch films I don't really want to know or discuss them until I get a chance to see them, so maybe I just don't pay enough attention to fandom anymore. But it does feel like something that happens, on Tumblr at least. In a way it doesn't surprise me - you see so much fanart, and so many headcanons and aus that diverge from the show, and so much hoping that a particular ship or storyline becomes canon - which it sometimes does literally because the fans requested it - that it almost feels like fandom can become quite separate from the actual stuff it's based on these days, like no matter what happens in a show it doesn't really matter, because the fans will be able to 'fix' it. In some ways, it makes sense that a fandom would emerge that almost doesn't need the source material. But it sucks. In a way, I assume it's an offshoot of the lore and meta discussions thing - just some people taking it a step further, assuming the stuff they're discussing WILL happen, and then comparing it to other shows that can't possibly live up to stuff people have basically come up with on their own. It's still weird to see it happen though, like you say. I guess it will be interesting at least to see how the show turns out and how the fandom evolves with it.