If they scheduled a double header, it would kinda nasty for the Braves as well. If today's game does get rained out, they may decide to play it (if necessary by either team) on Monday October 3rd.
I'm not sure how many pitchers the Nats will call up, but I cant see that many being called. White, Hughes, Nitkowski, Bray (maybe) if there are any others, we'll have to wait and see.