I would second Parmandur's recommedation. I would rather have a big book of Norseness... gods, religion, weapons, setting, new monsters, new magic, habits, culture, heroes, subclasses, classes, backgrounds, feats and everything else that might get a campaign going and then one for ancient Greek, Roman and Egyptian based cultures more than just another deities and demigods type product. I am not looking for something historically accurate, just a different way to run a whole campaign or cherry pick the bits I like. My guess is we aren't going to get either that or a new "here are thirteen pantheons" book either, but I am not sure why anyone would simply stick a bunch of unrelated pantheons in one book other than tradition. YMMV.