Posted this to the Pop refurb thread but I'll post here too.
Stayed at Pop 9/11/10 to 9/18/10. I requested building 3 / 50s to get a refurbed room, and got one. Room 3112. Flat panel TV, privacy curtain, new paint on the walls (one wall blue, others neutral).
Starting on Monday 9/13 I witnessed the refurb work going on in all rooms on the 4th floor of building 1 / 50s. There were signs in the central elevator about the area being renovated.
I did not see any work on building 2, and although I did not see inside any rooms, the doors on the ground floor of building 2 were still white while the doors on the ground floor of building 3 were painted lavender to match the walls. I am guessing the outside door painting is part of the refurb, because our door to room 3112 looked freshly painted. The ground floor of building 1 still had dingy white doors when I took a walk over there.