This year's main personalities: Kanjani∞
Program personalities: AKB48
Announcement within the month
Don't get too excited yet, it's only a rumour.
And as usual with 2ch rumours, it's to be taken with a pinch of salt.
But it might be interesting to note that Atsushi Akimoto, the creator of AKB48, tweeted on the 4th:
"After this, an unprecedented large amount of media exposure is scheduled around April.
Although it's an unknown area that no one has experienced yet, we want to take a chance with that situation."
Could maybe refer to the announcement of the personalities?