I love, love, love the imitation windows (BUT LET US PUT THEM ON PARTITIONS/OVER REAL WINDOWS *cough*). What I would love to see next are dynamic windows. They don't need to reflect what's actually outside (and I'd rather they not, I don't want to look at my neighbor's moogle house inside as well as outside) but rather, generic scenes from the housing ward. The beach. Palm trees and fountains. A grass-lined street with flowers and trees that sway in the breeze. We already know they can get time-of-day tracking, because the imitation windows can track the sun as it moves through the sky, and they can track positionals, because east windows get the sun rays before west windows do. This means they could show a different scene based off which side of the house they're on, and it could look consistent from side to side.

It would make rooms feel so much bigger! (In b4 'server limitations', I'm sure there are reasons why they can't, but I can dream )