I think that expecting Blizzard to release Reforged "AT" Blizzcon is quite silly.
1. I don't recall Blizzard ever launching a game, a patch, or a PTR/beta during Blizzcon. Maybe there was something, but overall it's not a thing that they "do".
2. It's a bad idea to release a game AT a convention, because:
a) A lot of the developers are away from work, because they attend the convention - and when you launch a new game, there's always a risk of things going sideways, so you need these people in the office to potentially develop and release fixes in a timely manner.
b) It would be a massive middle-finger to their most loyal customers (i.e. people who actually go to Blizzcon) to release a game during the convention and tell them: "oh, we've just released a game and everyone at home can already play it, but you - our "best" customers - will have to wait until you get back home, because... fuck you.
c) It's not really smart from a PR perspective to release something during the convention, because either this thing is going to be overshadowed by other announcements or it will take attention away from whatever it is they are showing at the convention.
So, nope - Blizzcon release is NOT going to happen. My personal guess is that there will be no "beta". Instead they will show a new demo at Blizzcon and announce the release date for late November/early December.
P.S. What I've said is also true for a beta. If there is one, it will either start before (doubt it) or shortly after Blizzcon. Not during it.
Agree 100% about Blizzcon release. It seems likely that there will be a presentation at Blizzcon, showing some screenshots and some iconic chapter(e.g where Thrall and Jaina fight chaos Grom). Than at the end of presentation they'll say that a beta starts in 10 days, but the attendants are able to play it during the Blizzcon.
However I don't think it'll be a complete/close to release beta. As I said before it's not how Blizzard does things, and it's also not how a game is published, even the most unimportant. It litterally had 0 promotion, and to be releases in few months sounds unrealistic. If there was any promotion, wowhead would have known it, I might have missed the news though.
I think it's far more likely that a beta will be in the early alfa stage of developement, and that it will last for 6-7 monts. So a release in may 2020 sounds far more realistic to me. It will also be bugged a lot in may and will be heavily patched in the next week, so it will be in a playable stage in late june/early july.
That would also allign with my other calculations. With TBC lanching in February, when (most) people get bored with Classic. Then Reforged in May, when (most) people get bored with TBC. And finaly WotLK in august when (most) people get bored with Reforged. Of coursed cause of bugged releases everithing will be a month and a half late, but by January 2021, Blizzard will have accumulated enough funds to last years with Overwatch only(lol).
I do however expect that Reforged will be upgraded post launch with addons(like "Trouble in Pandaria, for 15$ unlock a scenarion to help Chen and Li Li deal with trouble in Pandaria. For just 15$ you get a new hero Li Li with completely new abilities, a bunch of extra melee maps, a new Pandaria tileset, new creeps, and a Pandaren race for a scenario" or "Deaths of Chromie, help Chromie to stop her Death, for just 15$ you get a new hero Chromie with time based abilities, extra creeps, melee maps, new tilesets Uldum and Azuna etc.." and silmilar suff). But only 1 or 2 cause I doubt anyone would buy those. I personally won't and I wouldn't like it, though honestly I wouldn't hate that either.