Yeah, re-telling that same story 3 times is 2 times too many. The movie was more than good enough (especially that Naruto+Sauce fight at the end). Albeit, the manga is ending a little differently compared to the movie in that the main baddie has a very different design and the Naruto+Sauce fight was choreographed differently. But I'd chalk up the latter to them only having so many pages/panels to show the action and it was just really fucking good in the movie to be able to fit it all in.
Edit: It's gonna be a continuation of the story AFAIK. Boruto as the main character though