Unfortunately, iPhones won't be getting NFC anytime soon as they already have Passbook. The screen size will probably remain the same old 4 inch screen, and the hardware will probably be the same as what i have read in numerous articles on the web. They wont be changing the hardware till 2014. If the iPhone 5S/6 gets to have new color schemes it will probably look like the iPod Touch 5th gen (white on front, color on back, and that looks hideous). I agree with the faster processor and the better camera though.
BUT you shouldnt believe in the rumors till the actual unveiling of the phone. Last years rumor of the iphone 5 was that it would have a laser projection keyboard and a 5 inch screen but that didnt happen. You might as well get the iPhone 5.
Sent from my Galaxy Note 2