I own a MacBook Air 11'', and it's also a pretty unique machine in terms of small form factor and silent operation. I feel current MacBook Airs finally serve as a good replacement. However, the 11'' Late 2012 model was also quite unique in terms of being a perfect PC citizen. So one could run other OSes with zero effort. In fact, it was Linus' daily driver for a few years.

I wish other manufacturers like Lenovo or Dell tried to compete in terms of fanless design so that there were more options. Lenovo in particular seems quite unfocused as they release tons of devices all the time and good ones are much more expensive than Apple's offerings, at least in EU.

To be honest I don’t think the Mx platform in the 12 inch form factor will be good enough to be in an ultra lightweight class. I also own a 12 inch retina and while I really like that it is slient and very lightweight we probably need another generation to get that far to have good passive cooling and performance given that the form factor will have to put the battery and motherboard on top of each other. A bezel shrink with a notch would still work out though but it would need a high ppi and 500 nits brightness will further tax the battery.

The new Air is significantly smaller in volume, though.