As for some of mine...
Alinor Embershade has been living in Dalaran with her husband Vistor and their 2-year-old son Leannan (aka "Sprocket"). From what I understand of the general timeline in the setting/lore (versus game releases), come Cataclysm the boy will be 3. Anyhow, she's lucky in that way, because as far as I know Northrend is escaping the brunt of the Deathwingy Badness. However, she'll once more be jaunting out and about while Vis continues being a bookwormish house-husband taking care of the kid (at least being a mage does have its benefits in reduced travel time around the world, so she can be home for supper :D). Though she's still part of the Horde, Northrend stuff did sour her a bit on the whole faction thing...she is finding she prefers to throw in with more neutral factions more often than not, and let others handle the FOR THE HORDE deal.
Though she will be making those Bilgewater folks like her because she wants one of their vehicles.
Jaylie Moonblossom (night elf warrior) has been adventuring largely off-panel with her father, who she discovered a while back had been made into a death knight. Being who she is, she accepts this as "something that can't be changed" and moves on, especially since oddly, their relationship is better now than it was when he was alive. (Absentee dad, and the few times she saw him he was a jerk.) Her biggest concern at the start, I think, will be the night elf places-- Auberdine especially, then Astranaar. She'll probably lose her more 'neutral' stance toward the Horde in the wake of what's going on in Ashenvale (or even just what happened there in The Shattering that was blamed on the Horde). Previously she had been tolerant of Horde sorts, even liking a few individuals, especially when they had to work together for the greater good (Quel'Danas, Argent Crusade, etc)...but not so much anymore.
She and her father will certainly be taking part in the reclaiming of Mount Hyjal. Her mother is still alive and part of her life, but does not like leaving Darnassus like...ever. It'd practically take a direct order from Tyrande herself to make Indra Moonblossom venture away from Teldrassil.
Raighne Steelfist, dwarven paladin, would have been among those helping rescue/save people as much as she could during the earthquakes in Dun Morogh. She also will actually be a supporter of Moira Thaurissan, and for reasons like some other dwarves give in The Shattering-- that is, Moira is still theirs, misguided though she may be sometimes. And as Raighne herself is a dwarven woman, she understands a bit of the pressure that women can face in what is, you must admit, something of a boys' club sometimes in Ironforge. It was said that Magni Bronzebeard didn't think a female could rule as well as a male (which was a huge part of the rift between himself and his daughter-- he wished she'd been a son), and I would venture to say that's not an uncommon mindset, at least among the Ironforge dwarves.
Now, Raighne will like it more when Moira's rule is a bit tempered by the Wildhammer and Bronzebeard representatives, but she also rather hopes they don't just push her off to the side as well. And she rather resents the fact that Varian Wrynn (he may be the designated 'leader of the Alliance' or whatever but he's not HER king!) felt it was his place to try and assassinate the ruler of the dwarves. Meddling humans.
Come Cataclysm...well, she'll be out and about with all other adventurers. Not yet sure where she'll focus there, other than being of 'general assistance' where possible.
Anjuli Ironfang, orc hunter, has been thus far helping defend Orgrimmar from the elemental invasion, and will do what she can to help during rebuilding. Probably from just...being a hunter, heh. Providing some food. ;) She is fairly neutral in regard to Garrosh Hellscream; she supports him because he IS the one Thrall appointed as Warchief, and she wants to believe Thrall has good reasoning. She'll support Garrosh wholeheartedly because he IS Warchief, just not blindly. She'll also support their push into Ashenvale, and in The Shattering this mindset is touched upon-- Durotar, though the Horde (especially the orcs) did manage to carve out their home there and thrive), can't sustain the population, especially after the Cataclysm. They need what Ashenvale provides, the lumber and such; cutting off what trade there had been not only hurts Orgrimmar, it hurts the children of Orgrimmar as well. So to her mind, for the children's sake just about anything is justified as far as taking what is needed to keep surviving in Durotar.
She'll be interested in the Earthen Ring stuff simply because of an association with a shaman friend of hers, but not as involved with it as he is (obviously).
I have other characters, but these are the main ones. At least, on ThoBro. :)