The UCM05 which is the UCM with Rs232 interface will be replaced by the UCM/232 as soon as the stocks of UCM05 run out.
The UCM/232 has a Rs232 plug in module (RS232/PB) plugged in on top of the base UCM06 module, instead of having the Rs232 DB9 connector on the base board.
This means that UCM/USB, UCM/Ethernet and UCM/232 will all share the same UCM06 baseboard, the difference being the plug in module, ie USB01, ETH01 or Rs232/PB.
The function of UCM/232 are exacty the same as UCM05 and is sold at the same price.
The J2 shunt should be set to "485" position instead of the "232" position when the RS232/PB plug-in board is present.
You mention the UCM06 module, is this a typo or are you bringing out a new UCM version too?
Hopefully the PP2 jumper is moved to the edge of the board so is unobstructed by the daughtercards then (past and present versions). It's a real pain having to remove all of these first so the jumper can be bridged for flashing.