Pointless to add new content like the brawler's guild if not everyone can participate (ie: not everyone wants to spend 60k + on the invite) GG Blizz?
On a related note, I heard 3 rare mobs drop it at a low % idk if wowhead is messing me with me badly, but apparently they all spawn in some island (all the way to the left) in karasarang wilds. I go there (alliance) and the island is just some jungle, but on wowhead it says they're in a fort or something..
Just in case you aren't, I'm gonna answer you anyways. There's nothing saying you are guaranteed the right to see the new instance, any more than you got to get into ToES in the first week it was out without a raiding guild. There is no skill or time commitment necessary to get into the Brawler's Guild. If it was important to you, you could drop 50-100k on a ticket (assuming you don't waste your money and actually have a decent amount). The people who it was important to did so. You can wait.
And the fort appears once you've unlocked the Operation Shieldwall dailies. Do the quests in your log.
Difference being that raiding is steps towards progression (if that's your thing) whereas this brawler's guild is supposed to be a "just for fun" thing (unless you're desperate for the BoA fist weapon Also ty, unlocked the island and I checked those mobs and there was like 3 people camping each one. Lol.
It's like if pet battles got restricted till you payed 60k or farmed some over camped mobs first.