Very helpful thanks! I, for one, would miss the parallel processing - it's a very neat way of having a number of variations on one patch, without needing to scroll patches. And the larger touch screen is definitely helpful for ease of reading patch names from a greater distance, plus on-pedal editing.
But great that Boss are giving bassists options, and whilst I'm not trading in my (your ex :)) GX10, I would take this over eg a Zoom B2-4, which I guess is its likely target competition?