The reference for what is included is the kickstarter page -
As well as the results from the module voting announced here -
We might add a feature to send or receive MIDI over the USB device port connected to your Mac or PC, but I’m not sure yet when we’ll have time to do this.
The USB host ports already support USB MIDI controllers. The 4-voice wavetable preset that comes with the SSP works out of the box with a MIDI keyboard or MPE controller.