I was thinking about a movie where
Konahamaru joined the akatsuki and fell in love with chi chi from dbz
Thus goku enters and destroys the nv out of rage
And ichigo shows up with another haxxed power up and then Edward elric uses alchemy to change the shape of the world so that it won't blow up from the epicness and then superman shows up and then leaves
Freaking epic
I dunno, but you can bet it'll be a Naruto/Minato team up... again... They probably think that is why the movies have done well in Japan and they won't want to mess with that (perceived) formula for success.
I think the ideal movie would be Kahkashi vs or with Konoha White Fang. Something dealing With kahashi father would be cool. we dont know nothing about him except he was as strong or stronger than the sannins.