I want:
1) battery life of at least a week, showing the time and selected info from my phone. That means e-ink.
2) wireless charging. No physical connectors to wear out please.
3) Three user definable physical buttons on one side, whose functionality is programmed on the paired phone. I will set mine to get my phone to a) play internet radio for another X minutes, b) change to another station, b) sleep alarm.
That's because I like to use TuneIn on the phone to listen to the BBC when going to sleep, and if I wake up during the night. But fiddling with a smartphone UI tends to wake you up too much, whereas just blindly pressing a physical button on my wrist wouldn't.
The other thing I'd (ultimately) like a watch to do is just store data, which is then made (securely) wirelessly available to appropriately configured other devices. Like a personal LastPass.