I'm not sure if I was clear in my original question. I have seen some Retro Duo boxes that have Ver.2 printed on them like the one below. I believe I have ALSO seen some Retro Duo boxes that DO NOT have Ver. 2 written on them.
This means that there are TWO different versions of the Retro Duo. I am assuming the 2.0 is a revision of sorts, but I was wondering what changes, if any, were known.
