I believe WL is the next deluxe resort getting refurbed. It was supposed to have started, but been pushed back.
I do not want to be too harsh on Poly rooms. I really do love the place (look at my username) I just think the resort rooms and longhouses look less modern than some other deluxe resorts and when I saw the DVC studios and longhouse common areas I was left wanting more. I have the same issue where I need to have two full beds so I stay resort side. YC/BC refurbs were completed in the past 2 years and they were both complete overhauls so they really look new and modern. That said, my BC room in March had stains on the carpet and my YC room last week had scuffs all over the nightstand. Nothing major that affected my trips at all, I think I just have a very high attention to detail.
If you picked Poly for the south seas theme, dining, location on the monorail (the best IMO), etc you will not be disappointed by an aging room or older looking hallway! I think the darkness also comes with theme. The only deluxe resorts that I feel are "bright" are Grand Floridian and Beach Club. I feel the other themes all lend themselves to being darker/warmer.