I had the e-mail from DAZ about Carrara 6 (since I already own Carrara 5, I wish they'd stop trying to sell it to me again) and I think the top of the e-mail comprised three banners along the lines of "Beyond DAZ Studio"
"Beyond Bryce"
"Beyond Hexagon".
Not having the e-mail any longer, I'm not going to swear to the wording, but the impression I got was that Carrara 6 was being established as the next port-of-call for anyone using DS, Bryce, or Hexagon.   If Bryce, DS and Hex are going to be developed indefinitely and distributed free, or at rock-bottom prices, who's going to fork out for new levels of Carrara?    My guess is that Bryce, Hexagon and DS are being used to entice as many users as possible in the direction of Carrara 6.   If Carrara 6 succeeds, i.e. makes money, DS, Bryce and Hexagon will be history before very long, I suspect.