I’m also looking forward to having more watchfaces that display phone battery percentage. I know it’s possible with Tizen, but this requires a separate app to be installed on your phone and there aren’t many options. I find this function useful when my phone is on the charger and I can see where it’s at and go retrieve when it reaches whatever level I need.
I’m also hoping to see Google’s voice to text, as it has far better accuracy than Bixby. Honestly, that’s the only thing I would use Google Assistant for anyways. I do have a bootleg version of GA on my current OG Galaxy Watch, but it required going through a lot of steps to get it installed and working.