So you are wondering where the BMAH is? Rock on! Well, it's just a hop,skip and a jump away in Pandaria. Take your FP to Tavern In The Mists in The Veiled Stair
When you land at the flight master Shin the Weightless (56.7, 75.7), turn around until you see this:
Here is Madam Goya's hut. For ease of use to find her, you can always just listen to me, or go ahead and make a macro:
/target Madam Goya
With the latter option, you are more than sure you will get said item. =)
The ones that I see as major purchases are from the TGC set and the Mounts (of course). You will want to keep tabs on the AH, as items have changed within 24 hours (although I am guessing some are set at 48h. No way to tell yet until further info is out there.
I will be checking this daily and will update my findings asap.