Given the track record of Samsung and software updates, that'll be a solid no.
The Note 4 received two major OS Updates.
It started on KitKat; while receiving Lollipop and Marshmallow...
Just like every other Samsung that preceded this phone, I'm gonna go out on a limb and say that's the end of the line.
They couldn't even give the Note 4 the Theme Store in fear of people not wanting to get the Note 5, so I'm not even holding my breath for it.