I only really care about screen time...hope it gets 6+ hours of screen time but i doubt it...i typically get 4-5 hours with the Note 2...on weekends when I don't use the phone much that 4-5 hours lasts over 2 days but during weekdays i have to charge every night. I always see people get excited over 2+ days of battery life but their screen time is like 3 hours...
Battery still needed to power higher display and processor probably about the same usage we get now. Coming form a Noe 2 owner it really depends on your usage but id say about the same or a little better.