The dread doppelganger is the "default" version of the monster in the Land of Mists, so that's the version which will be covered the most thoroughly. They're natives of Zherisia and have their own society.
Outlander-doppelgangers (i.e. the MM version) tend to lose out to their Zherisian/dread counterparts in the Land of Mists, but they will rate a few mentions and are similar enough that
most of what applies to the dread versions will work for them IYC as well. One long-forgotten name from the early game-products will also turn up in a Dread Possibility.
Greater doppelgangers don't really fit the motif of the other dopps, being too powerful, too solitary, and too willing to risk hands-on conflict with their enemies (i.e. they're not cowards at heart). There's been at least
one greater doppelganger in the Land of Mists -- in fact, I know exactly what Sodo did to this potential competitor
-- but they aren't a part of RL doppelganger society and will, at most, get a minor subheading (like night hags or demiliches received in the VRGtWitches and VRGttL, respectively).
Ethereal doppelgangers, I'm still thinking about. Expect to see a token appearance by them, but
not necessarily with the same backstory as in the MMII.
The possibility of MMIII-style changelings -- suitably "Gothicized" and de-Eberronized, I
promise! -- will also be addressed in passing, although a full treatment of those is best saved for a possible "Races of the Mists" QtR article. Essentially, they'd be the doppelgangers' versions of calibans, and will be 100% optional additions to a Ravenloft campaign.
"Who [u]cares[/u] what the Dark Powers are? They're [i]bastards![/i] That's all I need to know of them." -- Crow
. Now I understand what they mean when they say "To be a manager you have to get your people to work together"...
