They aren't going to introduce a spec that is only playable through having allies or anything crazy. If they introduce a 'support themed' spec, it'd just be a dps spec with a more significant amount of group utility. I'm not saying that playing solo as any spec in the game is always supposed to be easy (example, a lot healing specs have very little damage for open world content), but anything they introduce does need to be viable for solo content.Things like debuffing/slowing enemies and buffing/boosting allies is nothing completely new either (mystic touch, windfury totem, power infusion etc.). But having it as a theme could be interesting. As one example, I imagine they could do a disc priest kind of thing, where they can spread a short duration buff onto allies to duplicate some of their crits as shadowflame damage or something.