So, if the mini mana bomb will be a toy, but obviously not the tabard - is there a faction toy imbalance (lol I almost can't believe I'm saying that), or is there some Ally-only toy I'm forgetting ?
no but there is more some only horde from Azshara quests, a hat
Actually, the mini mana bomb is not a toy. It was at some point in the beta, but that change didn't carry over to the live version of WoD.
That said, there are some toys that are Alliance-only and Horde-only. For example, you will need a high-level Alliance character to acquire Touch of the Naaru. The hat Zstriker mentioned is Faded Wizard Hat, a reward from a low-level Horde quest.
This item ended up not being included in the Toy Box because it converts to the Alliance-only tabard if you faction change.
what? i wanted a tabbard not this crap
And I've always wanted a miniature mana bomb (Fel Reaver, here I come!). No, actually, I agree with you - I would have liked the tabard because it's very nice looking.
But, it wouldn't make sense for the Theramore emblem (read: Alliance) to be available to/worn by Horde. The whole point of this lead-up to MoP is to emphasize that the situation is very ugly between the two factions, and will only become worse.