I agree wholeheartedly with the idea of the display being wider. The traditional shape of a watch was that way because of the mechanism inside. Wearables, like the Apple Watch, should do away with the traditional watches form factor constraint.
I would like to see these devices progress to more of a band form factor with a wider and curved display to fit the contour of our wrist.
My quasi-educated guess is that Apple figures they have the best shot at wide acceptance -- particularly with the first model -- if it doesn't feel "weird" compared to other watches, and that that's informed a lot of design decisions.
I think a curved display could be pretty challenging. You write "the contour of our wrist," but the contour of your wrist and of mine probably aren't the same, right? So is the display flexible? Is it the same size for everyone? Will someone with a smaller wrist find the display "wrapping around" more than someone with a larger wrist? What interactions will be made better by such a curved display, and what interactions will be made worse by one? And is the tradeoff appropriate?
I would like to see these devices progress to more of a band form factor with a wider and curved display to fit the contour of our wrist.