Can't Resist the Bling!

Raise your hand if you adore Blingtron 4000! *raises hand*

A blue confirmed that our awesome little buddy does have a very, very low chance to drop a mount and pet. It was also mentioned that his loot might be upgraded in a future patch.

"You are perceptive. There is a very small non-zero chance for a mount or pet from the Blingtron 4000 Gift Package. We heard you like bling so your pal Blingtron may be getting some minor upgrades to their bling in an upcoming patch.

With plenty of bling to go around, share the happiness. {◕ ◡ ◕}" - Rygarius

The original Blizzard post detailing the Blingtron and its drops states that "it has a chance (a very, very small one) to give the gift of an Engineering mount or pet."

It specifically names engineering pets, and since all of these profession companions are craftable, it looks like the Blingtron is just a secondary source.

But! Who's to say what type or kind of pet will be added to its loot table in the future. It wouldn't make much sense to add misc pets other than engineering ones, but who knows if they'll be unique to Blingtron's loot table or also craftable.

Personally, I would prefer if they were both craftable and a rare drop from him. That way if you're unlucky with crafting and/or purchasing the pet, you'll still have a chance at it once per day from Blingtron.

Man, now I have to finish leveling up my engineering alt! I stopped after I crafted the Mechanical Pandaren Dragonling for myself. :P