Naruto as a franchise is confirmed to continue. The original Naruto manga, though, is less sure. We might see a part III, we might not.
What we know is that this section is obviously drawing to a close, story-wise. But there's a movie coming out soon called "The Last: Naruto the Movie
" which appears to take place in the future when the characters are "young adults." Seems to take place about 4 or 5 years after the current events. It's also the "first entry" in the "Start of a New Era Project."
So we can conclude that they have a lot of things planned for after this current point in the series. We just don't know what
. I personally forsee something like the manga ending, we get a few epilogue movies taking place after the manga ends, then in a couple years a new manga starts up set after a long timeskip, following the main character's children. Or maybe even more of a timeskip, something akin to Korra.