Note 6 is rumored to future SD823
Even though some of people consider the Samsung Galaxy S series as the most powerful products in Samsung product category, it is Note series, in my opinion. And, the latest rumor confirms which series is more powerful.
According to the rumor, Samsung Galaxy Note 6 will be powered by SnapDragon 820’s modified version, 823. Even though there is no information about the exynos version right now, you can expect to see an exynos Note 6.