There's a buzz amongst fans discussion forums that the song Shonen will officially debut on ANN on 26.06.2010 (Saturday) and release of the full song ringtone version on 30.06.2010. I will update this post if there is a full version or partial version.
Got this great news from MashaPlus Info Forums courtesy of Izumisano (who got this news from HK Fans Forum (post #207 page 14), which the contents explain itself...
New CM on 28/5 with NEW SONG 「少年」 (Shonen, Boys / Youth)
Music / Lyrics: Fukuyama MasaharuArrangement: Fukuyamam Masaharu / Inoue Akira
Release on Chaku-Uta: 28/5
The CMs and lyrics after Read More link.
Originally can be seen here. I just checked and the CM is not posted there yet.
15 Seconds Version
Download : The CM (MP4)[1MB] | Sound only (MP3)[241kb]
FULL HD Version
The 2nd half you will see the Episode 1 CM previously blogged about here.
Download : The CM Full HD ver [Mp4][13MB]
Thanks to the HK Fans Discussion Forums (post #351 page 24), partial lyrics is as follows where fans claim the music resembles Niji but with the lyrics along the lines of Hatsukoi, so it is hopeful and yet depressing? I am sure there will be a translation soon:-
In relation to The Great Journey campaign.
You might be interested in the printed ads here.