rahm was to resign in a few months, not immediately. I think it was to be around Christmas.
Again, I'll believe it when I see it. Sources can say any number of things. The fact that some of those things might peter out to be true is more of an indicator of luck as opposed to the source being accurate.
Not that long ago, "sources said" that Sen. Roland Burris would resign because of his connections to Blago. That didn't happen.