I don't know what they can do with it to make it "must have." Standalone apps on a 1" screen? Built-in GPS? More sensors? Camera? Thinner? None of these things come remotely close to making this product interesting enough to buy.
Medical innovations..
If they can innovate a new technology that has a real medical function, it could be huge.
I'm not sure what..
How about they discover a way of NON-INVASIVE real-time monitoring of blood glucose levels.
No more finger-pricking and meter reading for the millions of people with diabetes.
Wow. Those glucose testing strips cost a fortune.. so an Apple Watch would be cheaper, as well as no more finger-pricking with a sharp lancet.. plus constant monitoring linked to alerts.. wow.. that would transform diabetes management.