Is there a schedule for firmware updates?
No, they just seem to show up.
What's yours so far?
Like Glo says, there's no announcement of updates. You just have to scan the forum and see who got a new one first then wait for your turn.
Newest one is:
I'm at version 4.2
It came with the car early Feb., but as you say 4.3 is out there and evidently allows off peak timing of charging which would be nice.
Since i have not received 4.3 yet, is there a way to proactively ask for a download since I need the timed charging capability
I'm sure something could be arranged if you're willing to sponsor a rocket to Mars ;)