The SD Card still probably won't work out of the box for legal/copyright reasons - hence the purpose of registering and downloading their firmware. Not much farther AtGames can take the FB line. Cartridge slot? Stella emulator upgrade? Paddles? Open Source/Customizable Menu?
Home arcade consoles/cabinets seem to be what's on their minds now.
Ah no. As has been done for the last 7 years or so AtGames looks to release new FB for the Christmas season. Notice Bill was asking for FB feedback for the next generation Flashback portable.