No.
The discussions above ae about the upgradability of internal parts, specifically the SSD module, and to a lesser extent other internal components such as the battery.
Thunderbolt is an external peripheral interface. To my knowledge, this interface does not handle the transfer of external power to the host device. The current MacBook Air has USB 2.0 ports; people are not discussing the availability of external peripheral connections in this thread.
iCloud could help as it would allow you to keep more available to swap onto your fixed SSD drive.
But... personally, I don't get why some are so up in arms over this. It's an ultra portable device and it looks like Apple is going for the best combo for power and battery life. Not upgradability. I'm guessing they have enough data at this point that shows not that many people want a drive upgrade anyway for a MBA. It would seem if you want an upgradable device, go for a MBP.