It's ok, I can think of some stuff...
1. Most important would probably be an always on display that is actually always on, not blurred out, and even when charging. At least as an option.
2. I would also like a nice digital watch face with a large one line time complication and a bunch of smaller complications. Kind of like the infograph modular if you could have time in the full width center complication.
3. Some improvements to the workout app would be nice. Like auto pause on more than just running. How about all gps based workouts? More than one metric screen would also be nice. perhaps some interval features. Feels like they threw this app together real quick and hasn't cared about it since.
4. Did someone mention siri?
Ok, mostly software stuff, but still stuff that "Apple can do to make things better".
And how hard could it be to have context based complications? Let's say I have stocks top right - but when I have an alarm on or a timer running, it should swap it for that - and automatically swap back when the timer is done! And maybe one for weather and swap it for battery percentage when battery is below 20%
They can and should have made the complications way more clever quite a while back