Well, the Koreans will get the better and more premium Galaxy phones since it's Samsung's hub. I am glad they didn't sell it in the US though since it means that a slippery slope occurs similar to the Xperia Z2 and Z3. Flagships should be flagships for about a year.
As for a 64 Bit Processor, we won't see the tech fully implemented for about 2 more years. I think the Note 5 will have one, more along the lines of a Snapdragon 815 or 820 rather than an 808 or 810. I expect about a 2.5-2.7 GHz 64 Bit Processor since clock speed doesn't really need a huge increase. Phones are fast enough as it is. Knowing Samsung's bold spec lines: 4 GB of RAM, Snapdragon 815/820, 20 MP Camera, 4k Display, and more metal being used into the phone. The Note 4 is so good, so I don't really care about what rumors are leaked right now since I don't have plans to replace my device anytime soon.
My problems with the iPhone 64 Bit Processor are the amount of cores and the lack of RAM. Ideally, 4 GB of RAM would make 64 Bits better, but iOS runs on little RAM. However, Apple creates stagnant software continuity by focusing on the casual experience instead of investing more time and resources to productivity. It took the iPad Air 2 to just get 2 GB of RAM.
Dual core is not enough since it's not optimal for spreading resource management w/ the RAM. Quad core spreads the functions to more cores when necessary.