I'm posting a preview of the Brawler's Guild bosses if anyone is still interested in how it looks/what they do. I got to rank 7 in around 1 hour or so (Before the invites and I couldn't find any at the BMAH now to finish it) and I decided to share it since I saw most people stuck on rank 1. I wanted to do this before but I realised I got everything wrong (even audio and video quality \o/) but now it's fixed.
Here's the rank 1 bosses while rank 2 is processing.
Rank 1: Bruce the Crockozaur, Random Mogu Guy, an angry Shoveltusk and a sissy dressed as a Torturer.
Here's the rank 4 reward as a bonus, the Clock'em mechanognome battle pet.
I expected it to be harder and I filmed all of it so if I died I could watch what went wrong so I didn't want to actually upload any of it . That was before the invite system and you can't get into it now on the PTR. I also double checked and I'm only rank 6 and 75% (you need rank 7 >.>) so I can't issue invites myself. They don't have that much health though.