The guitarist and bassist, Jasun and Troy Tipton, have started another band called Cynthesis with former Zero Hour singer Erik Rosvold. They've released two albums so far, DeEvolution and ReEvolution, which sound good from what I've heard, but I don't own either as of right now.
If I am recalling correctly, Zero Hour hasn't officially broken up, they're just on hiatus. I'm not sure the chance of them reuniting is very great at this point, though.