I agree. I think there must be something wrong the the numbers. A 12" MBA that reduces the bezel in the current 11" MBA makes sense.
If it's really a 12" MBA, it will be exactly the same width as the current MBA. That's because the current smaller MBA isn't 11", it's a 11.
6" and the new 12" will have a different aspect ratio.
Here's my calculation. Using the
DPI calculator.
The dimension of the current 11.6" MBA display is
10.11" × 5.68"
The dimension of the rumored 12" MBA is display is
10.18" × 6.36"
Width-wise, the difference is only 0.07", imperceptible on something over 10" wide. That means the (rumored) new 12" MBA has virtually the same display width as that of the current 11.6" MBA.
I don't know what it'll look like but that does give us a few possibilities in terms of the form factor size and the bezel on the new MBA:
1) There's always a possibility the rumored size isn't entirely correct. For example the new MBA might not have a 12" display but instead a ~12.5" display. That means making the bezel smaller will make a good sense, and otherwise it will be about as big as the current 11.6" MBA.
But assuming if the new MBA really does have a 12" display,
2) Apple could decide to keep the same bezel size and make the form factor slightly taller.
3) Instead Apple could reduce the bezel just on the top and the bottom, while keeping the bezel the same in the sides, unlikely in my opinion.
4) Or they could reduce the bezel and at the same time make the keyboard smaller as well, unlikely in my opinion since they tend to care a lot about the keyboard and the trackpad.
As with the iPad Mini discussions - it's not really a 7" tablet but an 8"+ one even though everyone ignores the fact - the decimals in the diagonal and the aspect ratio do make substantial differences but often times forgotten.