We can assume the new MacBooks will come with Haswell. Perhaps the Iris graphics will be driving the Retina display? Right now the Retina MacBook comes with Ivy Bridge and a separate GPU although I don't know if it uses integrated graphics to drive the display.
rMBPs have switchable graphics and will use both the IVB GPU and the nVidia GPU to drive the display. The IVB GPU is noticeably choppy on some types of scrolling when you've got it set to 1680x1050 equivalent or higher, so the Haswell improvements will be welcome for newer buyers.
Optimistic news sites and forum posters seem to expect that the Air will get Retina treatment this year. That seems extremely unlikely to me. Even it if were cost/tech viable, it would significantly erode the differentiation between the Air and Pro lines.
Is a safe bet for both the new 11" and 13" Airs to get the non-Iris GT3 part? Or is the 11" in weedy GT2 territory?
