You can see the list of changes here:
viewtopic.php?f=1&t=20946Some preliminary clarifications:
- The game previously only had the ability to save a single pet with your player file. Now all of your pets will save when you quit. They will reappear when you log back in. Any creature that you can create or control using a class ability is now considered a pet for this purpose including but not limited to: store pets, elementals, animated dead, controlled dead, charmed and dominated creatures. Tribunal guards that you can order around are still not considered pets.
- If you don't have a pet store pet already, you should always be able to buy one regardless of the pets currently following you. If you already have a store pet, it should no longer affect whether you can get pets through any of your spells or abilities.
- As a consequence of some of these changes, elementals and probably other pets can now pick up items. Most of them won't be able to wear most equipment due to their creature type. And while multiple pets can save, their equipment still will not. Therefore when you quit, your pets will remove and drop all of their equipment before leaving the realms with you. You may want to macro up a quit alias to have them remove and drop their gear before you quit so that you can pick it up yourself.