Won't upgrade
As a note 2 and 3 owner I wouldn't upgrade. Not much over a note 3 that's practical. Think I'll wait for v5 or v6 subject to some big fixes. The vpn bug really pisses me off and until they fix that I won't buy another Samsung.
I also won't buy if they don't honor app store languages since living in Asia but having my settings as UK I still get the useless app store versions listed all in Chinese. No fucking good if your can't speak Chinese is it (hint - look at my language settings).