that rationalization is a failed one. why make the Z4 when you have a drop-top 3-series, then?
i think this is just BMW blowing smoke up people's asses, trying to get them to buy a more expensive Z4 until the Z2 is ready for production in a couple of years. it wouldn't make sense for them to come out and say "yeah, we're working on an entry level Z2 for people. it's coming out in 2 years, hold on until then."
this way, those who might be tempted to get the Z2 will instead get an entry-level Z4, or a 128, and then they'll start releasing information.
just my $.02
oh, and BTW, this concept image is much better.
