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They are apparently going with the original PSOne controllers so no dual-shock.

That cuts out a few games, particularly - Ape Escape 1 and 2 and a few others.

Also, not offering a Dual Shock controller at first leaves them open to backtacking on their comments that this is it, no more games on this thing. This is basically their version of the Super NES Classic Mini and NES Classic Mini.

Though, there is a mysterious expansion port on the back (has the cover on, opposite the power supply). What could that be?