This was planned for over a year. We had to design a new PCB, write instructions, and wait for the board to be manufactured. The PC boards are due in next month (4 -5 month lead times).
Why design a new PCB? The existing Motor Driver board was obviously designed by Lionel to both take a switch command, coming from the Radio board, and output track voltage to a Radio PCB. The cost should be under $5 to add the external 5V regulator necessary to drop that track voltage from the old Motor Driver PCB, to the +5V necessary for the new Radio PCB. That would save $23-$5=$18 by not having to buy a new Motor Driver board. This drives the cost down to $31 per switch, to do 4 switches, or $27 per switch to do 10 Switches.