Let's see, Keshire (Neo*) has been working for eight years on his Torn Earth project, I'm sure he's still devoted to that right now. He's the one on the edge of the world that hasn't seen another human being in years, living off of stray bots and the like.
Marcopolo (moderator, modder), pfft, Canadian, this guy loves Oblivion. He might still be playing with TES games, either that or Team Fortress 2 or L4D or Portal or something. He's the one with the rusty computer. Ailia (forum moderator, modder), Satan (forum admin, modder), ninjakarl (original Fable modding veteran), they're in hiding in Washington state, Wales and Australia, respectively. Not sure if they'll be coming back.
Hunter (FE author) and Pe_Ell (site admin), well they're in IRC with me right now. Hunter says he's down for Fable 3 modding, at least for a little bit, get a feel for the waters and if he thinks it's good enough to swim in, he'll help out. Pe I think has already bought a domain for what might turn into a new site, might as well, he owns like twenty domains already.
Hmm... OldBoy (forum admin and modder), need to find out if he's in. Other modding staff include morerunes, DarkenedSoul and jwc2200 (all moderators, modders), not sure if any of them will be joining our parade but I certainly hope so, they're good guys. Last I heard of BayStone (CBox author), he was working on another project, Day After the Night Before or something like that. Don't know if we can pull him back. chaos is the only other major modder that I can think of right now, don't know if he'll be coming back either.
*Keshire reverse engineers the files, cracks the formats, labels the unknowns, helps with the programming, tells us what to look for in models, textures, animations, compressions, definitions... if one were to name a single person as the most important person to Fable modding, it'd be this guy.