I'm guessing there are likely to be a couple of Companions with next year's content...
So. We've had a Dragonknight (Bastian), a Nightblade (Mirri), a Sorcerer (Ember) and a Templar (Isobel). Which suggests that we might get a Necromancer and a Warden next...
Also, we've had an Imperial, a Dunmer, a Khajiit, and a Breton, so we're likely to get different races...
And we always get one more "honourable" (Bastian, Isobel) and one more "dishonourable" (Mirri, Ember - although Mirri doesn't like you getting caught thieving, it's the getting caught she objects to, not the thieving.)
And we need to finally have a Companion that actually *likes* the Dark Brotherhood. Since Ember actually gets bonus rapport from doing Thief heists, why not a companion that gets bonus rapport from doing DB sacraments?
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So... how about an Argonian Shadowscale worshipper of Sithis. Perhaps they could even be the necromancer-type since Argonians, like Dunmer, seem to have fewer scruples in that direction?
And perhaps pairing them up with something like a Bosmer Warden who is a Green Pact fanatic :-)
(Then we'd still have Redguards, Altmer, Orcs and Nords to go, and have to start either inventing classes or repeating them.)