It always depends were you come from. This is the 7th generation and i have had non. Pretty exited to be buying one in probably November and also pretty exited to see what they bring to the table tomorrow now that Series 4 and 5 had very little change asides adding the always on magic.
New color (midnight blue i assume?) could also be interesting. Quickcharging sounds like a must with the sleep features. Very keen on how these sleep features actually look compared to the plenty-full offerings in watch, phone and other devices already. The mental health stuff could also be interesting, if it covers more than a fully fledged panic attack but just notices when you are angry and gets you breathing notifications or something along those lines. Could be pretty neat.