Well, on the PTR, Breanni from dalaran now Sells two new pets.
These pets are Calico Cat and Albino Snake.
They are listed for 40g, and they look like this:
Cat:
Snake:
Of course not many people will know about theyr existence for like 2-3 weeks after 3.3 goes live, so you can buy them with 40 gold from vendor and list them at auction house for like 100g. This will give you nice profit.
You can do this thing first, by letting your character near breanni before the pre-patch maintenance, and when the patch goes live just buy it and be the first who puts it at ah.
You dont want to spam trade chat tho, some people may know and act like haterz, telling everyone what you are doing.
Good luck!