So I've been going over the chronology and the fluff in the revised rule book. I've come up with a couple of theories about the next faction to be released.
I think there is a definite possibility that a Confederate army could be on the way. New Louisiana was formed by Robert E. Lee when he made a clandestine pact with some Voodoo witches. This could make for a cool team. Some old style Confederate soldiers using some semi-modern tech, as well as some Voodoo users and their Zombie minions. Could be a lot of cool options for these guys.
My other theory is based off of the teaser in the back of the revised rule book. Rosebud seems to be reporting something in Japanese, Sanctuary, I think. I have a harder time imagining what exactly this team would be comprised of. Martial arts? Maybe Samurai? Maybe even dragons of some sort. Could be some cool Eastern style sorcery and what have you. Would be cool if they used new takes on traditional Japanese weapons, like bows and arrows and katanas and spears.
I also thought that It'd be nice if they came up with some form of Axis powers, Allied powers dynamic. One that would allow some loose affiliations between the factions. We'd need a few more before this can happen of course. It sometimes feel unlikely that there would be a war that had this many opposing sides, seems nations generally manage to group together so they aren't fighting on multiple fronts.
Let me know what you think, and what your ideas are for new factions. I read some stuff on the British force, and I liked that quite a bit. The Arthurian style knights... I love these brainstorming topics.