The options seem like they would be:
- New Wall Connector or New mobile connector
- Home DC charger
- Upgraded SuperCharger (charging snake?)
- New charging thing connected to the solar stuff (direct connect from PowerWall? charge power wall from car?)
- New in-car charger option
- New PowerWall charger (nothing to do with the car.)
Of these, I am not sure what they could do with the a wall connector or mobile connector other than change the form factor. the speed is pretty much a matter of the number of Amps that it can support, and the current one can support more than most cars can... so upping it does not seem very useful.
A home DC charger could be interesting, though from what I have heard, the cost would have to be pretty high.
Upgrading superchargers with the charging snake (auto connection for autonomous cars) gets my vote, if he wants to do his drive cross country next year without getting out of the car, he would have to start soon in upgrading superchargers, and it fits with the autonomous car push. Not sure why do it as part of a Solar City announcement, but I guess if they are merging...
Something that more directly connects the cars with the solar gear, like a direct connection to PowerWalls, or allowing a house to run off of a car battery as a backup would fit the venue, and be a cool thing, but it doesn't quite feel right in this case (not sure why though, I dont follow Solar City stuff very closely, so I am likely to be off base here).
It could also be something IN the car, (especially since he said "Charger"), something like a triple charger option or something, (charge at 120A) which would need an upgraded wall connector., but that also seems unlikely since even at 72A it is close to or over the limit of most homes without significant infrastructure increases, and beyond most public chargers.
Perhaps a "charger" that has nothing to do with cars, an upgraded charger for the wall connector, since again I don't follow the PowerWall or solar stuff as closely, I cant really judge the likelihood of that..