Is it possible to have
1. Garmin connect to do dive planning and push it to the watch?
2. Use compass to lock a direction on land and use that heading while diving?
3. Overlay gas switch depth/time, ascent rate etc on the dive log graph?
For #3, those data are displayed in Subsurface if you import the dives from your Mk1.
Not only that, but Linus is apparently working on (or at least playing with) BLE imports for the Descent Mk1. So I'd expect wireless support to be coming at some point in the relatively near future.
I was reading subsurface forums where Linus is directly working with folks as a developer for Mk1. Mad respect for this dude.