In answer to you're comments...
1. So what ? Extra expense for an external DVD....but the air did not need an internal drive
2. get a usb hub....connected devices won't run at top speed...but most peripherals you'd maybe want to connect don't need to. Most devices can be connected wirelessly or via bluetooth i.e printers
3. Sealed in battery could be a problem, particularly with an investment you'll want to keep using for atleast 4 years.
4. wait and see, i'm sure it's gone through rigourous QA...and i bet it's not as brittle as you make out.
5. wait and see, it probably will run hot but does have an alum case.
6. Why do you want a dock?...it's not a typical business machine. One of the advantages of the air will be that unlike most windows laptops or older apple laptops, there'll be a complete smooth bare suface top and bottom....no stickers no compartments...no dock connectors.
7. USB dongle for ethernet........before you say it...yes i know you'll have only 1 usb port free......but that's why you bought the usb hub

Anyway most of the time the free usb port will be for you're usb stick. All other communication from the Air is designed to be via bluetooth, wifi or ethernet. Even superdrive access is possible over wifi to a remote machine.
oops, It appears there's only one usb - well just means you need to do a bit of plugging and unplugging, not the end of the world. All though i'm sure they could have squeezed in an additional port.
8. you'll only reastically want firewire for video capture. No doubt they'll release a dongle if you desperately need to be capturing video into the air..
I wouldn't want to be an early adopter of this product...as they are bound to remedy some of the issues in future revisions. And the price will probably come down aswell.