Soul of the Aspects

The Soul of the Aspects is a smaller, companion pet version of the Heart of the Aspects mount. This radiant whelpling flies by your side, celebrating your adventures together with aerial summersaults and twisting corkscrews.

Source
This item is available from the shop or the In-Game Store for $10 or €10. It was released on April 10, 2012.

Pet Journal
The Soul of the Aspects is said to be possessed of mercurial moods ranging from stoic and deliberate to unpredictable and erratic, to loving and deeply pensive.

Untamed but friendly, this golden dragon will fly the skies with you.
 * In-Game Store

Friendship flies on tiny golden wings As your faithful companion pet, the Soul of the Aspects flies by your side through the skies of Azeroth, celebrating your adventures together with aerial somersaults and twisting corkscrews.
 * Blizzard Shop

Letter
Players are mailed this pet by Breanni: