Found this piece of news from Ayu China Forum and I don't know where they got the source though, but AyuChina is pretty reliable though.
It's said that double A-Side single will be released soon, the title has been decided, 『MOON/SKYLINE』
待望の新曲両面A『MOON/SKYLINE』リリース决定！この夏には両で曲夏の夜のために「MOON」ZEST HONDA SPARK TV-CMをもう、一曲は雨上がりのは晴れです「SKYLINE」、また「Rock'n'Roll Circus」秘密の未公开曲だ!
Credit: kongmm @ AyuChina
Shared by Ayu's Story
Take out with full credits!