I also have heard a lot of chatter in Washington D.C., where I live, about how the U.S. is getting ready to bomb Iran. I have not heard anything about the targets, though, but nuclear facilities makes sense.
I hope you mean that the regime change will happen from within Iran, and you are not hoping for a U.S. military invasion. The chatter over here is that we don't have enough troops to get the job done in Iraq, so I don't think that a move into Iran will happen anytime soon...that is, if Bush does not call for a draft, of course