If you look at this comparison chart you can see that the iPad Mini 3 is exactly the same as the existing iPad Mini with Retina Display (now called iPad Mini 2) with the exception of two things:
- It's got Touch ID
- It's $100 more expensive
Does the Touch ID imply that it also has an NFC chip for ApplePay? (Apparently it does, and the iPad Mini 2 doesn't.) That's an odd thing to leave off the comparison chart.