Adding a cart port to the Atari, INTV, CV systems will raise the cost and potential failure liability. Beyond that, I heard over at AA that AtGames could change their mind on an SD slot for the "2015" edition of these, if the sales are good. Again, it's more cost, and their margin is probably not terrific to begin with. The other issue is that the license holders of the Atari, Intellivision, Colecovision brands may not want the specter of piracy hanging over their heads.
I also hope that they supply overlays for all the games they are including, but probably won't. I think many collectors will buy these because they look pretty darn cool.
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