Blizzcon 2016 was broadly similar to Blizzcon 2018 in terms of distance from the expansion, and it had 7.2 details and reveals alongside a 7.3 tease. We might not get a tease, but I'd be shocked if they did a Blizzcon presentation on WoW, which is still a flagship title, and only talked about a patch that would already be on the PTR for months and a demo for a 15 year old game. We might not get all the 8.2 info we want, but we'll get some.