Well, according to Eiji Aonuma, by way of an interview conducted by magazine Electronics Gaming Monthly, the Twilight Realm has received a makeover and will now feature a vibrant set of colors, distinguishing itself from Hyrule in that way. No screenshots of the changed look have made its way onto the internet at the time of this post, so hopefully we'll see something pop up soon.
[Update: Photographic evidence may be seen here.]

