Here is the question I have. Why are they debuting the 6000 series with only their mid-range cards? Based on the chart that shows the 6870 is only comparable to the 5850 in performance, there must be a flagship model they plan to release later. In the past, a new graphics card series has always debuted with the fastest, most expensive flagship version, and the mid-range cards followed later.
I'm also wondering if that is the reason for the change in number/naming scheme. A lot of people think the 6870 is going to be the fastest card on the market. It isn't, but the name change is creating some hype for people who are expecting it to be the new Nvidia-killer. After hearing reports about problems with the AMD chip manufacturing process, it might make sense to sow some confusion. That also would explain the availability of mid-range cards, instead of high-end. If you add it all up, for me, it only raises more questions.