For what its worth, I was in the Short Pump (Richmond, VA) Redskins store and the manager told me that they didn't see rolling out the Anniversary uniform until right before the start of the NFL season. He said that they were told at a meeting that the Skins petitioned the NFL to wear the jerseys three times during the NFL season instead of once in the preseason and twice during the regular season. I believe they won that appeal. The only confirmation he gave was that they did reveal the yellow, scripted "R" helmet would be used. The jersey, trunks, and socks are still top secret.
Hope that helps.
I'd like to add that the store manager in the Short Pump, VA team store indicated that the NFL had intended for all NFL teams to wear the throwbacks in at least one preseason game, but the Skins appealed and will be wearing them for three regular season games.