A real dilemma...
A little bit... After owning a 2010 11.6" MBA since it was released, I miss the portability of the 11" now that I have the 13". The slight size/weight difference is noticeable to me.
On the other hand, I have an iPad, which I use for most of my web surfing, and an iMac as my primary computer. The laptop is reserved for real computer work (primarily complex Excel spreadsheets) that must be done on-the-go and the extra screen real estate makes the 13" much more tolerable.
My wife converted from her MacBook to my old 11" MBA and loves the size. The 11" screen is small, especially for the over-40 crowd. It sounds crazy, but the 13" is big and heavy compared to 11". Ultimately, everyone's going to have their own opinion based on how they use the laptop. You can't go wrong with either one.
This is a real dilemma also for me...
I am used to a small Vaio TZ (with 11,1 inches screen, SSD and optical drive), but now it's 5 years old - and, although it's still working fine, it's beginning to be old, full and slow (with Vista...). I have in fact used this as my primary computer, and have been travelling a lot, so weight and size matter a lot for me. But, on the other hand, also a big enough screen and keyboard (most for wordprocessing - Office Word 2003, and 2011 now for Mac, I think) are very important for my everyday use.
Only based on pictures so far, I think the Air 11,6 has a good keyboard (also compared to the 13,3 one, but I am afraid that the screen will turn out to be a bit too small. (BTW, I have tried the Vaio P too, with its very high resolution and with an 8 inches "widescreen": The letters on that screen are far to small to me to read without taking a really close look (exept in Word where one can enlarge them a lot in an easy manner) and further, the Vaio P keyboard is far too "crampy", small and with some very badly located keys.)
So, back to the present dilemma: MacBook Air 11,6 or 13,3: As weight and footprint matter much for me, I have so far been tempted by the 11,6, because of its portability and wow factor. But now I am much more uncertain: The better battery time and bigger screen of the 13,3 make me more and more really consider that model.
Also the factors of heat and especially fan noise are very important.
On this basis, I am very interested to read about the experiences that users in the real everyday situations have to share.
One other thing also: I read somewhere that there would be color options - also a white one. Is this correct?