This is not one of the base configurations for the MacBook Air, and thus Amazon.com won't offer it (it has never offered more than base configurations in the past). If you would like 8 GB of RAM in your Air, the most popular options is to order it from the Apple Store: http://store.apple.com/us/browse/home/shop_mac/family/macbook_air/select
I understand that B&H may offer some 8 GB configurations, but you're guaranteed to get exactly what you want if you order it from the online Apple Store. That's what I did for mine - I have the 13"/i5/8 GB RAM/256 GB SSD configuration.
You ask a good question and one that I posed to Amazon before making this purchase recently. Unfortunately, Amazon staff could not provide clarity, but I'm pleased to let you know that the item comes perfectly sealed from Apple. In this case, what frustration free packaging means is simply that the item comes in a box specifically made to support (protect) this item in transit. That's all. I'm very pleased that the item was in the same condition it would have been in had I purchased it directly from Apple.
I never bothered to find out. When I got mine it was not turning on properly. I would bush the on button and it would immediatly turn on and off again. Next time it would work fine. Two weeks after I got it I went to the Apple store for help. They gave me a new computer in the box and it works great. First rate for Apple.
The only major difference between the old and the new versions is that the new version has a longer lasting battery life. The new version 11.6 inch can hold up to 9 hours on a charge and the 13.3 inch can hold 9 hours. Compared to the old version of 5 and 7 hours, respectively. Hope this helps!