Images of the Galaxy Note 8 have leaked online out of China and by looking at it, there are basically no differences when compared to the Galaxy S8 lineup. This doesn't necessarily have to be a bad thing, since the Galaxy S8 has an impressive design, but people have at least expected that it will have a fingerprint scanner under the display, which won't happen.
The main difference between the Galaxy Note 8 and Galaxy S8 will be the addition of stylus, a bigger screen and probably improved specifications. Other than that, at least in terms of design, the two lineups will practically be the same.
That was also confirmed by newly leaked images of the front panel as well as first Galaxy Note 8 render.