Highly doubt it, it has a more chance of being a Ninetails evolution than Zangoose.
It being a Ninetales evolution actually makes less sense. Ninetales has a BST (Base Stat Total) of 505. Thats pretty high for an evolution. The highest ever was 515, Porygon2, and when he evolved it only went up by 20 to 535. If it is a Ninetales evolution, it porbably won't be huge. It would also have to have 2 items to evolve, seeing how Vulpix and Ninetales are Fire Stone evolvers. Porygon2 and Z are actually the only Pokemon to ever have that (fun facts). So, its possible, but Zangoose is more likely for reasons of item, BST (his is 458, just right), and the timing is better, after all the new evolutions from RBY in 4th gen, they may find it necessary to use more from 3rd. But thats just speculation. And an obvious point, Z has one tail. Thats just a giant leap backwards...
Mightyena is possible, he has good BST and evolved early, with no items. But the body shape isnt really that of a Hyena, even though thats a blurred line. He's definitely my second choice if Z is an evolution.
Absol is also a good choice, medium BST, and the body shape is ok. Its not as feral looking as Z, but the possibility is medium. This is more me not having a good feeling about it, but I could definitely be wrong.
Skuntank... just no. I dont feel like putting a reason... just no.
Lucario is a giant NO!! Its already SUPER powerful, with a BST of 525, and powerful moves. He's already featured as a main character in the movies, was already SUPER hyped, he's in SSBB for gods sakes! If its Lucario I quit playing Pokemon.
Weavile is similar to Lucario with it being powerful already. It evolved with an item, so it would have to double evolve, it will have evolutions spanning 5 gens, similar to Magmortar and Electivire, but I dont think it will happen.
Floatzel, Im not sure about it, Z doesnt follow the common swirl tail pattern, or look buoyant in any possible way. But stats wise that could work, as well as item.
Pachirisu, I cant see that transitioning between the two...
Thats if it evolves :P