From what i have seen on the recent ones i have :
- if you order a 3/5 modes S2+ you will get the green pcb with only Convoy written on the spring side. This version can be reprogramed to run Biscotti (also called sometimes "new firmware", if i understand correctly this is the one TK is talking about) but you have to cut the wire that connects the pin 5 to ground on pcb to be bale to reprogram the AtTiny13A mcu and the 7135s may not work well in the lower mode.
- If you order an S2+ with Biscotti (or "new firmware") already installed you will get the red pcb with FX-12 written on the spring side.