The hotel is now officially a Westin. I am in DC and saw the sign being replaced on Tuesday. I got an email on Wednesday, October 4 that the hotel is now the Westin. My reservation number stayed the same and "all elite benefits will be provided accordingly." I cancelled the reservation as I don't need it now anyway - hah.
Note: I walked into the lobby this week and it looked exactly the same as it did when it was the Renaissance. Only difference was the sports bar towards the back looked a bit different.
-RM