Austria and Hungary getting in separately is pretty unlikely IMO. If ever I think they'll get in as either the HRE or Austria-Hungary under the Habsburgs. I'd love to see the Indonesian empire get in, if only because it'd give Southeast Asia serious representation in the game, but I doubt it. I really really need to get around to modding soon. There's already an Israeli/Herbrew civ mod out, though I do doubt Firaxis will pick them for an official expansion due to politics and the fact that someone out there is going to overreact whatever they do.