One lone image (see above) of Tesla's updated Firmware 8.0 has leaked out on the German TFF forum, along with some discussions of what's new.

See comments below for a brief overview of what's known to be new with Firmware 8.0:

https://www.reddit.com/r/teslamotors/comments/4s57hd/new_firmware_80_ui_leak/d56lc4h

Model S and X owners will surely spot the differences. There's likely more to come soon, but for now we've got only these few details on 8.0 to provide.

Tesla does say that Firmware 8.0 is "coming soon," but the automaker isn't committing to a release date at this point in time.