Yeah, not really interested in the new MB myself. 13' MBA looks awesome.
3 hours less battery
less CPU power
less GPU power
worse camera
$300 more expensive
less space between keys and keys/touchpad & less travel on keys
fewer ports = extra dongles (less portable and adds $80 or w/e)
1' smaller screen
It's also a personal preference to have a slightly bigger screen. Funny fact is the MB has a base 720p vertical, less than any ipad ever created. Just not something I like to work on. The screen is definitely nice, but it's just crispier text, the MBA screens are completely fine. PPI of ~130. The iMac is at like ~110, this monitor I use now is ~90. It's completely fine. In fact my PPI on my 22' monitor is low because I use 1680x1050, because 1980 x 1080 is too small (like the MB's native resolution is for me), and I love the 90 PPI. With the MBA at ~130, extra pixels isn't a dealmaker for me.
The base model ($999) is still the most popular model and fine for most users (e.g. students etc), making a $300 lower deal for better specs (see above) a steal.
For those who go up to $8gb of ram, it's still $200 cheaper. And if you add a Nifty device you get the same storage an still be cheaper. Even an 8gb/256gb ssd, it's priced the same, but you still get more battery, more cpu, more gpu, better camera, bigger screen, more ports, nicer keyboard etc.
Compared to the MBA 11' it's not as bad. Slightly bigger screen but not bigger laptop, same battery, no SD either, bigger keyboard etc. BUT, the 11' is so cheap, it's a whole different category. As the 2012 11" already beats the new MB in terms of specs, you can get a cheap new 2014 MBA 11" for what, $700-800. Comparing that to a $1300 device is just silly.
So yeah, whether I'm poor or rich, I'd prefer the MBA 13" over the MB.
I'd also prefer the 11" MBA over the MB, unless I was really rich, at which point the MB is the better pick.
I expect the MB to come down to $1200 next year, with options for 512gb SSD etc more more money. At that point USB-C will have a **** ton of cheap extras. They'll boost the battery to 10h and the Intel M will get 30% more powerful. The Air doesn't get a refresh and a year later they stop getting sold when the MB gets another upgrade. At that point the MB will be awesome. But the first edition? Reminds me of the ****** 2008 MBA that they charged $1800 for. Back when a 64gb SSD cost a $1300 premium. The MB is full of new parts, over time the price will come down on those and it'll be a nice deal. For now, MBA still wins, unless you're rich and looking to upgrade your 11' MBA.