This one kind of came out of nowhere.
Apparently, Redskins punter Josh Bidwell was injured badly while warming up for today's game against the Rams. With about 90 minutes to go before kickoff, Bidwell appeared to hurt his leg, and kicker Graham Gano and others helped him off the field. It's unclear what caused Bidwell to get hurt, but it appears he won't play today.
If he can't go, Gano will handle punts. It's unclear who would be the holder on field goals, but the early guess is that it will be Rex Grossman.