I don't think the 810 is slated to be released until 2015 so don't hold your breath for its inclusion in the Note 4. In fact, I don't believe the 805 has even been officially released in a device yet so not sure why you'd expect the Note 4 to leapfrog an entire generation of CPUs.
It's going to be plenty powerful with the 805 if that's what it does in fact get.
The Samsung S5 LTE-A and the LG G3 LTE-A both use the 805. And if I'm not mistaken, the 810 isn't due to be released until the second half of 2015 so I'd look for it in the Note 5 or other phones released in that timeframe or after.