If true, nice little updates.
Keep driving forward.
P.S. Inevitably people will not be happy, but incremental improvement is very important. Retina on an Air is probably a year or two away at the earliest. Haswell is a large jump.
Retina on the Air will probably never happen.
The whole idea of the Air is that it used different components to optimise for size and weight - so no DVD drive, SSD storage, integrated graphics. Against the old MBPs, that made a huge difference.
If you add a Retina display to the MBA, you've just exactly described the 13" MacBook Pro with Retina Display.
13" MBA:
Height: 0.11-0.68 inch (0.3-1.7 cm)
Width: 12.8 inches (32.5 cm)
Depth: 8.94 inches (22.7 cm)
Weight: 2.96 pounds (1.35 kg)
13" rMBP (difference to MBA):
Height: 0.75 inch (1.9 cm) +10%
Width: 12.35 inches (31.4 cm) -3%
Depth: 8.62 inches (21.9 cm) -3%
Weight: 3.57 pounds (1.62 kg) +20%
The MBP doesn't taper like the MBA does, likely to include a larger battery. It's also got another 300g in weight, again likely due to the larger battery or increased backlighting or whatever.
The point is that the entire reason for the MBA existing is that it's more portable than the MBP. As we can see, it's not really
that much more portable that it warrants another line. With a couple of hardware revisions the difference is going to reduce even further.
So the only remaining reason the MBA has to keep existing is its lower cost. If it were to include a Retina display, it would likely have to bulk up a little and the price would increase. It would just be exactly the same as the 13" rMBP.