I think an article said they were going for the Marilyn Monroe look with the photo. Japanese fans are already calling her マラリンゴ (Mararingo) on Twitter.
Edit: This article makes mention of it (if you can read Japanese):
Edit 2: The song titles are all symmetric, unsurprisingly. The first two and last two tracks are both 6 characters. Tracks 3-6 and 8-11 are 7 Characters, and the middle track is one character, Ima.