Even tho I like the poll, you've been a bit unrealistic.
You won't see IPS display and USB 3.0 on the next Air, there were no sign so far for this to happen, so don't get high hopes for nothing.
True, unless the MBA doesn't come until way past WWDC. I believe Apple is going to forgo USB 3.0 for now and wait until it's incorporated in the chipsets as a standard configuration. So you're correct in that assessment as it's not realistic to expect now.
I believe an IPS HD display is possible, and it will for sure come within two updates. The longer Apple waits to upgrade the display, more likely 3D or OLED play into picture. The display is obvious and easiest way to make the Macs an extremely better experience for the user.
I think the dedicated GPU is very far fetched. I know it's a possibility, but it just doesn't seem likely that Apple would release a Core i7 MBA with a dedicated GPU three weeks after a 13" MBP with a C2D and Nvidia integrated GPU. I mean, wouldn't the Pro get the new technology too? I think it's completely probable that the MBA gets a C2D and Nvidia 320m GPU. All of the rest is HOPE and speculation.
Sure I want the MBA to get a Core i7 at 2+ GHz and a discrete ATI graphics card, but why wouldn't Apple do that in the 13" MBP also? Seriously, it could have done that with Core i5 CPUs in the 13" MBP, and used an Nvidia 310m GPU. Funny thing is, the 320m is integrated and performs better and uses lower energy than the discrete 310m Nvidia GPU. So integrated isn't always worse, and the 320m proves that.
My Guesstimates:
I am sticking with 85% probability to get an MBA update before or at WWDC with C2D, Nvidia 320m, 4 GB RAM soldered to board, 192/256 GB SSD, and glass trackpad.
As far as other stuff... far less likely... and not going to happen...
Far less likely - IPS HD display, new MBA case (might be thinner at thickest point but not tapered so has more space for components and cooling), two RAM slots, discrete GPU,
Not going to happen now (maybe later) - USB 3.0, LightPeak, and 10-hour battery.