Importance of mobile payments
For the iPhone 6 a bigger screen and more RAM is all well and good, but I agree with Tom, a simple and secure mobile payment system would set this iPhone/iWatch duo apart.
I use individual apps to do mobile payments (Starbucks, Boloco, etc). It's nice to not be reliant on a physical wallet, and cash and cards etc, but using each brand's app for mobile payments isn't practical. I want one mobile app that works for payments everywhere. I assume Apple will exploit this need but it will have to earn the public's trust in ways that Google Wallet and others have not.