This can be a spoiler, but since there was no official announcement from Fuji tv and the source is unreliable (:P you'll see, I'm not talking about the girl who wrote about this XD) for now let's label this as a rumor!
Today Arashi held their third concert at National Stadium in Tokyo.
During the mc, member Ninomiya Kazunari teased the audience about his potential guesting appareance in the last episode of Natsu no koi wa nijiiro ni kagayaku, the drama whose member Matsumoto Jun is starring in as the main lead, since there is sort of a tradition about the member who will have a drama in the upcoming season will be also the guest in the last episode of the drama of the member in current season. hope this is clear to non Arashi fans ^^;
So the others will guessing he can star as a part-time in Kusunoki's talent agency and stuff like that XDDDDD
I'd like to see this released... but I have a different "usage" for the potential guest :D
more info @ the source:
http://community.livejournal.com/natsuniji/57425.html