Just want to share that I booked a 2 nights stay with a standard room at POP, followed by a 11 nights stay with a preferred room. I put "80's" as my request, I called and spoke with a Disney CM AND I sent a fax with a specific room request (9238 or close) (with Touringplans). We wanted a room close to 9238 and got 9237 for the whole stay.
It was a corner room next to the stairs, closest to the lobby and transportation. It was a perfect spot and since it was only one flight of stairs we only used the elevator twice. It was really close to the bus, we could use the computer pool laundry with less people and pretty much only an extra minute of walking to the food court, compare to the preferred rooms.
We got in late, 11 PM at least, and still got our request. I'm 90% sure it was the fax, since the room number was so close, but who knows. I would advise to do all three: request online, call and fax.
I walk by the 70s building (10 I think) everyday and we saw people painting the outside walls and at night we could see a little bit inside the rooms and it looked like they were done with the painting, some furniture was there, but no light fixtures yet.