Note users buy the Note for the S-pen and multi functionality first, screen size 2nd in my opinion.
I for one did not as the screen size was the deciding factor and never used the other 2 I mentioned above.
I will think the 6+ will get some Note users that do not use the Spen or multiwindow functions but that may be a very small population.
I am one of those people though.
I think that number is higher than many people here think. You have to remember that readers here are generally more tech savvy and use far more functionality than the typical consumer. I mentioned a while back in a thread that I have a few friends that own Note's and they admitted that they never use the S-Pen, and wanted the Note primarily for the larger display. I realize this is only anecdotal evidence but I think the number of similar customers similar is greater than many here think. I rarely, if ever, see a Note user in public actually using the stylus.
Doesn't mean everyone who gets presently uses a Note will head back to iOS--I'm sure a majority are happy with the user experience and prefer Android. But I think it's fairly well documented that the biggest gripe former iOS users had was the lack of a larger display.
Normally I don't really care too much about sales numbers, market share, etc., however it will be interesting to see these numbers over the next 6-12 months to see how much impact an increase in iPhone display size actually had.