What I have subsequently found out is the it is only the green DVD nav disk that BMW have withdrawn from sale, the red CD for MKIII and purple professional DVD is still for sale in V14.

I've just ordered red V14 for the MKIII, but what I want to know is the difference in content between the 3 formats. Being DVD you'd think it has more data on it, than the CD but what is that data?

If the latest CDs are still available for the MKIII, other than being a bit slower what is the point of an upgrade to MKIV?