I'm trying to find where I read it. I'm having trouble with that, so if I can't cite it then obviously it's simply hearsay until proven otherwise.
There are apparently going to be two versions of the "Six". One is full CF. The other is an aluminum front end with a CF back end.
Which is completely bass-ackwards of what made the Six13 so great. The Al rear triangle and seatstays were the best part of the CAAD frame, while the CF top and down tubes damped noise from my hands.
I don't think that bike is progress at all over the Six13...nor do I think it offers a logical simplification of the product line, now that I know there are two models. The Al/CF hybrid Six is a Six13 gone backwards and wrong.
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Good night...and good luck