The kit v4 without RBPi is available again in the zynthian shop. Version has bumped to 4.6 because of the new Zynaptik-3 module, that comes in 2 flavours:
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Standard => with MIDI ports & 16 x GPIO (MCP23017) that now can be used for connecting the official v4 controllers (encoders with switches), or for adding custom switches to your zynthian.
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Extended => adds 4 x analog inputs (ADS1115) & 4 x analog outputs (MCP4728) that can be used for CV/Gate, etc.
More about the new Zynaptik-3 module in this post:
Enjoy!