For the first time I'm seeing the new interface beyond just the homepage, now on the flight selection page as well. The background is a light gray; the empty space around the fare is white, and the text is variations of blue and black. The minimal difference between the light gray page background and the white boxes where the flight info and fares is displayed makes me feel like I'm taking one of those color-blindness eye exams (using Google Chrome as my browser; haven't tried in IE or Safari). Pretty much the same layout and format otherwise, just different colors. And the fares and information are easy to read.
ETA: just pulled up DL.com via Internet Explorer. Seeing the old style even at the homepage.