and they include one "10 in 1" cart already. Expect it wont be long before someone has a Pi or Arduino shim to feed this thing any ROM one likes, assuming theres not already some direct facility for it to have an SD card or something.
I suspect there's few people who own many original Atari 2600 or 7800 carts that really want to use them like this: surely that'll degrade their antique value? Its like "dont play with the beanie babies"... And emulation will be available with all sorts of extra features as well as fewer drawbacks.