I can see people are still defending the MacBook Air. Lots of posts saying that the Air is not outdated if it does what you need; and that any laptop will get outdated in a few months.
Well, these people do not get the point. Yes, the Air will become outdated in a few months, according to rumors. Apple will release a brand-new machine, equipped with a a 12-inch retina display and that will be super-thin. That's what rumors are saying, and they are probably true.
The current form factor dates back from late 2010. It's been four years. If you buy the MacBook Air right now, you will buy a laptop that has updated specs (as of now), but the form factor will be replaced by something more modern in a few months.
Every laptop gets outdated, that's true. But, the way Apple does things, there's two ways of seeing this outdated thing. A MacBook Air bought in 2011 has exactly the same appearance as one bought today; it won't have the same speed or storage or battery life, but it has the same screen, the same weight and the same look and feel. It's outdated in specs only, but not in the whole computer experience. But the 2014 model will get outdated in a few months, if you believe the rumors that say a new machine is coming.
Now, if you are fine with an outdated machine, then it's OK. If you prefer the 13-inch Air with its non-retina display over a 12-inch retina one, then it's fine as well. But that's personal preference. From an objective standpoint, yes, the Air will get outdated. If you need to have the most up-to-date laptop in the world, then it's your call.