Guys don't rip me a new one here... A high-end MBA with 256GB SSD and Arrandale sounds great, but I'd love to see a low-end Air option with Nvidia Ion or CULV chipset. Since a lot of us use the MBA as a second computer for travel, battery life is paramount. And with Ion they can drop the price and still keep those juicy Apple margins. This would be a great business laptop and maybe even light photo editing as the Ion has the same 9400M as the current models.
The SSD they're using has to be way less costly now than when they started using them. I don't know if a low cost MBA is ready to replace the old Polycarb Macbook yet, but I'd say we're getting close.
The big hurdle is still the price... with a raft of ~3lb CULV Windows laptops on the horizon, let's hope Apple is planning on offering something remotely competitive.
Apple isn't interested in the low-end market. It can't compete on price and can't make up in volume what it loses in revenue. Having said that, what about the oft-rumored tablet? It may end up filling the niche for a second computer at a better price point than the Air. And based on speculation, I'd say 3lbs would be high for this device.