that's nonsense. if you don't need something right now then that alone is a "possible reason" to wait.
Maybe his 2 year old machine is perfectly adequate and the new iPads will be attractive enough that he can just get one of those and wait for the next cycle of Airs or Pros.
Maybe they announce that Mav is coming out in December.
Maybe there are any number of reasons why waiting wouldn't be a bad idea. In fact, when it comes to a purchase like this I can't think of a single reason to wait other than the fact that you simply can't (or just don't want to).
no your ideas are nonsense. If someone wants a computer, why would they wait unless an update is imminent. The airs were just updated, and he will receive Mavericks for free if it is released on the 22nd. If it is released in december like you think, it will be a $29 upgrade. I think 99.99999999% of people would prefer to use a computer for two months for a small fee of $29 if they want to upgrade in december. You are buying a $1200+++ computer and you are going to hold off because in two months you will save $29???? Dumbest logic I've ever heard.
DO NOT WAIT!!! There is ABSOLUTELY NO SENSE IN DOING SO.
This guy is not debating IF he wants to get a new computer, or IF he wants an air or pro, if that were the case, yes wait.
If you KNOW you want a new computer, BUY IT NOW, you will get no benefit from waiting other than wishing you had the computer to use during the time you are sitting there waiting. The battery life upgrades alone are worth upgrading to a new air.
I would personally get the 13" because I think the 11" is a little too small personally for the type of work I do, but if you are just a casual user, the 11" would be fine.