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If classes are simply weapon (or in the case of mages, magic) types, as SE seems to imply, they can not make pet classes if they don't somehow make the pets become the "weapons" itself.. which I don't see them doing. Thus, we are most probably not going to see pet classes.
What we are probably going to see though, are pets not based on any class whatsoever allowing much more versatility, which seems to be the point of this whole Armoury system. When the pets aren't locked to one class, you have more weapon choices and more customization options than just using an Axe or Scythe for example. If you want to be a pet user wielding a lance, then be one. And to strengthen your added pet, you'd have to sacrifice the master's power. The system would balance itself, although since that kind of flexibility allows for much abuse from the player's end, it's no wonder SE doesn't want to make them available right at the start of the game.
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