Okay, so as you might've noticed over the many WoW expansions
that have been released we've received 3 new playable classes so far.
It occurred to me that these all fill a different spot within the
WoW Cosmology which can be viewed below.
It makes perfect sense to me that none of the new classes share
a spot on this chart in order to diversify the game's new class portfolio.
When they made Death Knight, that filled the Death slot.
When they made Monk I'd say that would be well within the domain of Life.
Then they've made Demon Hunters which naturally fits within Disorder > Fel.
As you can see for yourself that leaves us with 3 of the outer domains that haven't been
touched upon regarding newly added playable classes, namely Light, Shadow and Order.
Now... the only class I can think of right now that touches one of the outer domains and
has has been talked about a lot throughout WoW history because there are
people who want it to be made playable is Dark Ranger which would fit the domain of
shadow like a glove and shadow seems to be a theme heavily touched upon for a good
while now.
One of the other classes that people have talked a lot about is tinker, while I don't
see this class belonging to one of the outer domains directly I could see this fitting within
the center domain, namely reality. So if they'd add tinker that would mean
they're adding a center domain class while halfway through (read: in the center of)
the outer domains. I'm not a tinker enthusiast but it would make sense if you try to see
things as a pattern.
Another pattern would be:
edgy class > silly class > edgy class > silly class
AKA
death knight (edgy) > monk (silly) > demon hunter (edgy) > tinker(?) (silly) > dark ranger(?) (edgy) > arcane domain class(?) (silly) > light class(?) (edgy)
TL;DR
If we assume Dark Ranger will fill the Shadow domain class slot. What classes do you
believe they'd add for the remaining outer domains, namely Light (Holy) and Order (Arcane)?