Okay, well. At this point, it certainly looks like there's enough interest to justify giving some thought to exactly how this might be done.
My inclination would be to aim for something that is (by Exalted ways of reckoning, at least) rather small-scale, focused more on the people and their relationships than the town-stomping and whatever else they might get up to because Exalted are absolutely terrifying.
As for group size, if this is something I'm going to be running this -- and I don't feel any overwhelming need to run, though I'm willing to -- I'd be most comfortable with a relatively small group of PCs making a fairly standard party of maybe five or six, all brought together by pre-existing ties and/or circumstance in that way that tends to happen to player characters.
The specific circumstance, however, could be any of several things, and the choice would impact viable options. I'll go through what I've got off the top of my head. The first four will revolve around the four schools the Terrestrials use for higher education just because they're such an incredibly convenient way of gathering together a batch of PCs, but there are a few others after them.
If any of these have some particular appeal for you, shout out; likewise if you've got any compelling options I missed.
The Heptagram would lean almost everyone in a sorcerous direction and allow for maybe one or two exceptionally gifted and wealthy mortal dynasts among the Exalted. This is also the only option presenting a particularly strong opening for elementals or demonic servitors, though they could crop up elsewhere.
As with all of the Terrestrial secondary schools, I'd probably suggest a cohort of students, since that would put everybody together in the same boat.
The House of Bells
Like the Heptagram, but with students of war rather than sorcery. The House of Bells gives us strong ties to the Legions, which have some of the Realm's strongest flavor.
The Spiral Academy
Who doesn't like playing bureaucrats-in-training? But seriously, it's one of the better schools for intrigue. It's also the only one of the four set in the Imperial City, opening doors for access to estates and business outside the school while still giving us the convenient structure the school would provide.
Cloister of Wisdom
Immaculates (probably in training) opens a lot of doors for... well, the kinds of intrigue that only the Immaculate Order gets to deal with. Facing down grumpy or rebellious gods, training in supernatural Fu, and practicing a kind of pseudo-asceticism that conspicuously doesn't seem to forbid having tons of sex? It's an interesting choice, if nothing else.
Okay, the House of Bells doesn't have all the Legion-flavor. We could run with a group that's actually one of the Legions, and while Terrestrials are rare enough that they're usually spread out over the Legions as high-ranking officers, there could be a special, elite task force or something. Going that route would pretty much preclude anything but combat-oriented Dragon-Blooded, though.
The Wyld Hunt
On the subject of special, combat-oriented Terrestrial task forces, having a Wyld Hunt party traipsing about the East chasing after loathesome anathema opens the doors for a wider array of adventurous Dragon-Blooded, since Sorcerers and Immaculates would be welcome on the team. Like the Legions, though, mortals probably needn't apply.
The Thousand Scales
It's like the Spiral Academy, only everybody's graduated. We'd have to work a little harder to give everyone reasons to be involved with one another, but that's not an insurmountable obstacle.
The Immaculate Order
Likewise: it's like the Cloister of Wisdom, only everybody's all grown up. The same surmountable obstacle applies as with the Thousand Scales.
What goes on behind a given dynastic house's closed doors? Well, sex, obviously, but could explore the specifics for ourselves, if we wanted.
There's room to drop a Lost Egg or two into the Cloister of Wisdom, but the Stair would give us a game full of them, allowing us to center in on the school and the Realm while still letting people come from all walks of life from all over Creation. Of course, that's limiting in its own ways: no mortals, probably, and likely nobody properly raised in the Realm.
We don't need to center on the Realm, after all. This would probably have a lot in common with the Legions option, above, but... Lookshy! A lot of people like them better.
So. What are your thoughts and preferences, everybody?