Thank you!
Yes, I'm very tempted to buy right away. I bought my current MBA just a few weeks before new models came out and I never really regretted it. But for this time around, there is this slight hope that an update in the MBAs will get them 8GB entry RAM and maybe Retina, and of course Skylake which hopefully will even further improve battery life (I'm kinda on no battery right now...let it bet 1.5hrs at most). Retina certainly isn't high priority and I've been doing more than fine without it for the last 4 years. But having recently updated to a 5K iMac (another reason why I don't need a - high-end full-power - rMBP), I noticed it is a "nice to have", after all.
I have to admit I fear that features from the MB will make it to updated MBAs, such as the keyboard. I really do not like that keyboard.
It really comes down to the Pros (maybe 8GB RAM, maybe maybe Retina (although less likely), probably Skylake) and Cons (Keyboard, increase in Price, discontinuation) of a potential update. Right now I feel like I'm gonna wait and IF the MBA is discontinued or I don't like the update at all, I'm kinda hoping to snatch one of those BTO models at Macmall (or do they order from Apple directly and don't have them in stock?)
No idea about Macmall, but your chances of returning a BTO is definitely better with Apple directly.
I feel very confident that a new MBA will NOT have a retina display. That would reduce the battery life significantly and raise the price, then you'd basically have a rMBP 13" without the added ports. 8GB might become standard, even though modern memory-management 10.9.x forward has improved greatly and unless you run virtual machines is less critical with fast SSDs at your back, than before with spinners.
Check out the PC competition Skylake laptops, especially those with hi res displays, most tested battery life is sub 8hrs.
Even though Dell claims 18hrs on the XPS 13.
Except for the retina iMacs, nothing much has impressed me the last few years from Apple.
It's missing Steve's magic touch.