In last week's scan, Weekly Shonen Jump revealed that Zetsu Tobi will be in Naruto Shippuden: Ultimate Ninja Storm 4 and revealed some really small screenshots of him in action. Bandai Namco has released these screenshots today and even though there isn't too much going on its pretty much clear that he will be playable.
Naruto Shippuden: Ultimate Ninja Storm 4 will be released on PC, PS4 and Xbox One sometime in Autumn 2015.