Matt Ramos, who was invited to the premier of The Super Mario Galaxy Movie, has stated that the film has two end credit scenes which he says you will want to stay for both. Thankfully, he didn’t give anything away. The Super Mario Galaxy Movie launches in cinemas worldwide on 1st April.
Apparently The Super Mario Galaxy Movie features two end credits scenes

Wario and what Donkey Kong movie lead in? My assumption is Wario is next
It does not launch worlwide april 1st. (Japan will get it until the 24th)
Princess Daisy?
Sets up the Starfox movie and teases Daisy for the next Mario movie