Yeah at first I was really turned on (no pun intended) by the idea of having the same "instant on" response that the iPad has on my MBA. But then I started to remember my MBA (2008 model) pretty much is instant on (from sleep) regardless; that was always one of the features I loved the most.
Now what I *hope* is that the change to Flash RAM will allow the effect of "instant on" to not only feel even faster (hard to imagine I must say) but last a really long time (up to a month standby sounds great to me). The only complaint I'd had on my old MBA was that if I unplugged it and left it sitting around, the "instant on" wouldn't hold for more than a few days without going into a deep sleep mode which took a lot of time to get out of. From what I can tell, the new MBA is going to last a lot lot longer.