This is not in the documentation yet (I will try to update it asap once other bugs are solved.)

In the character battle pet API all references to the battle Pet ID (this is the unique id that refers to a battle pet in the character's journal have been replaced with a battle pet guid field.

So in the petSlots api we now have a "battlePetGuid" field which is the link to the "battlePetGuid" field in the pets api.

Sorry for the change.

with the patch yesterday, the api calls JoinBattlefield and AcceptBattlefieldPort became Blizz-ui-only functions. By doing this, Blizz has restricted the user to blizz-only buttons to queue up and leave queue.

This has no impact on the better bots, as they make the calls directly... but it does break addons and macros that allow for easy queuing. It also kills community addons like oQueue

A few HUNDRED people have posted to this thread asking for a blue response.

http://us.battle.net/wow/en/forum/topic/7200032168

Would you be that blue?

(edit: for some reason the quote field loses it's source link, authors name, and blue color...)

This forum (and my post) is only related to website community API and doesn't refer to the in game add on api at all. Unfortunately posts in the UI and Macro thread are your best bet in regards to the in game API.