Since Alinor posted her lot over on tumblr, I thought I'd have a go at doing this for my own list of characters.
Isandare Blackwell - He's increasingly feeling his age as time goes by, and he's tired of fighting. The physical strains of changing as a worgen haven't been doing him many favors. Deathwing and the Firelord were immediate threats to Azeroth and it needed doing, but the Horde...He still has no use for the engineers of Gilneas' fall, but he's had relatively pleasant conversations with various individual members of the Horde via the tome and from his acquaintance with the Argent Crusade. Depending on how things go, he may get sucked into the conflict but his heart won't be in it overall.
Kires the Silent - He probably won't take much notice of the tensions ramping up since he's usually out in the wilderness by himself. Also, he views it less as Alliance versus Horde than as the living versus him. The main thing for him may be his having to take a trip out to meet Crow whereever he's stationed, or to reschedule their meetings altogether. He'll also continue to keep up infrequent communication with Molyn, and maybe run into her a few times in the city, as he thinks of Stormwind. If/when Kires encounters pandaren he's going to be very bemused since they're new to his current worldview -- he doesn't remember anything of the peoples and worlds that the draenei met during their centuries-long flight. He'll probably view Pandaria as a way to expand his leatherworking repertoire, and little else.
Lisbett Thriceborn - She'll cheerfully skip off to war, fully relishing the opportunity to call new and strange people (and their mothers) names and horrify or punch them in the face or other reachable body part. Sometimes both! At least, it'll be easier to call people's mothers hamsters -- Deathwing himself was entirely too mad for any of that to have much of an effect. She'll also collect Pandarian insects to take back to her labs for study, armed with magically reinforced jars and boxes. (She'll petition the BAU for additional lab space and supplies.)
Luonnotar Ice-Eyed - She'll follow the Warchief whereever he goes, working on making up for the honor that she lost when she fell to the Lich King. As the Warchief orders, so she follows to the best of her abilities. Also, in life, she was one of the colormen who supply scribes with the colors they use for their inks, and she'll keep an eye out in Pandaria for new flora, fauna, and minerals that can be used to supply colors and inks.
Jamie 'Crow' Crowhart - Still working on training as a paladin. He's going to go where the Church and King Wrynn's armies send him. Very Earnest Young Paladin focused on bringing the word of the Light to everyone for their own good. Juggling his responsibilities to the military, the Church, and Kires all together. He's going to struggle with how alien the pandaren are, since he still has a lot of difficulty with worldviews that don't match his cornfed-Westfall-born-and-raised views very well, such as the druidic teachings of the kaldorei or gnomish practicality. Let alone the views of the wilder troll tribes or the Ramkahen.
Theodoria Russell - Continuing her work with SI:7 on an as needed basis, going on short missions when it's workable. The rest of the time she'll keep up her cover as a clerk with the Cenarion druids in their work to restore the worlds, raising her daughters, and tormenting her little brother Isandare. Knowing that Cenarius once again walks the waking world is making her cover a little less of a cover because hey, wonder still exists. She knows it's going to take a long time to retake and restore Gilneas, but they do what they can.
Kaihanar Sunflight - Continuing his courier work with Lazirus's employer. It's not much, but it's Silvermoon. He thinks sometimes about taking up arms for Silvermoon (and the Horde) again, but it makes his breath come faster and he has to change subjects quickly. The city is familiar, and he's not leaving it. Well. Except to visit Dalaran where he can pretend nothing's changed.