The Blossoming Ancient is available in the Blizzard Store. Cool surprised me with one yesterday after buying one for himself as well. The pet comes with this note from Malfurion:
Even the mightiest of ancients was once a single, tiny seed.
In time, this sapling will grow into one of the Cenarion Circle’s greatest protectors.
Until then, it will serve as your faithful companion.
I love how he has the ability to change with the seasons and have almost levelled him to 25. You can’t help but think of Tome when you see this pet – more for the name than being a tree though.
Personally, I love using the Blossoming Ancient in my 2 pet levelling strat against my NPC.