User blog comment:JustJacobGamer/SUPER SMASH BROS. 5 ROSTER LEAK!/@comment-30243710-20170606022850/@comment-33720623-20170607020208

Welp, I'm sure they would've planned it out by now if so. But sneaking into Nintendo Headquarters reveals to me that only SSB5 is currently planned, So it's unlikely we will get SSB4.5.