I remember visiting this website once...
It was called Akb48 to sing Theme Song for NHK NCON 2017 - Akb48 Daily
Here's some stuff I remembered seeing:
NHK announces AKB48 will sing the theme song for their 84th NHK National School Music Concours (short for NCON) Junior High School Devision.
The theme of 84th NCON will be "Dream", AKB48 will sing the theme song, and the lyric will be written by their producer Akimoto Yasushi. The theme song will be revealed in March 2017.