MMO-Champion is reporting another new pet that's been datamined from the latest PTR build. Yes! Another possible new pet. :D Soul of the Aspects!
Could this be the companion who's model was datamined by Wowhead not too long ago (Chromatic Dragon Pet)? Perhaps the new rogue legendary weapon guild achievement reward? From the looks of the pet's item icon, it does strike me as similar to that of the Chromatic Dragon Pet model.
Unlike Lil' Tarecgosa, though, this companion is BoP and not Bind on B-net account. So maybe it's not the next "legendary" pet.
Whatever this vanity pet might be, it sounds pretty epic. *Insert giant echo'ing voice* SOUL of the ASPECTS. It just sounds awesome lol.
I've added it to the list of possible new pets in 4.3, and hopefully we'll see a preview of this companion soon!