While there isn't much detail on what exactly the update brings (the change-list for all the devices just mentions Android security patches), it does come shortly after Samsung promised regular (about once per month) security updates for its devices in the wake of Stagefright.
The update is currently rolling out, and should hit your device soon (if it hasn't already). Meanwhile, you can also manually check for it by heading to Settings > About device > Software update on your phone.
The Note 4 international variant IS a 32-bit Snapdragon 805. The Lollipop OS may be 64-bit, but the hardware isn't.
do you think note4 has 32bit chipset? are u dreaming? it just proves that you were not able to have note4 before. and your comparing its benchmarks? keep talikng brod..lol