@Zellsantal Wrath won't come out till BC content has all been completed. Raids have been coming out about one per year. We just had Zul'Aman open up. There's still Hyjal, Black Temple and Sunwell. I'd say Wrath won't come out for at least another 3 years. However, there is a Wrath test server. You have to buy access to it but there are people playing on it and even raids. It is very low population tho.
Alot of the cool items for transmog can either be bought on the website or from the Ethereal Bazaar.
The only spec that can summon a ton of "pets" at once is from the Demonic Persistence legendary mystic enchant. It will summon a ton of wild imps and is a pretty strong spec right now.