I've been looking into IAD and talking to a few different people. Expect 22-23 lines in IAD until May, then there will be around 44-45. Also, don't expect many reserve conversion lines, maybe 1. Reserves will probably be early am and afternoon shifts, don't expect any nap reserve. IAD ain't ATL and don't expect all the "frills" ATL has (like tons of open time to swap and I'm also willing to bet there will be plenty of red arrow days up there too). Also they will try to make lines commutable but there will be a lot of 7am duty ins and 9pm duty outs due to IAD's banks of flights.
There will have to be to cover the naps. There were 2 nap lines for Feb.