Tesla promises Model S recharge 'faster than you can fill a gas tank'
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This approach would allow a hybrid battery/capacitor approach, where the car keeps using the quick charge capacitor and only relies on the battery for longer distances and in places that don't offer the red light charge option.
Elon alluded to it already: http://green.autoblog.com/2013/05/14/tesla-model-s-battery-s...
EDIT: now that I look at the link you added, I stand corrected. From the exploded diagrams, et. al., that I saw it didn't look like it could be swapped out in five minutes. Tesla's designers obviously disagree. :-)
And now that I view the link on a desktop browser, the one who posted it speculates that it's car sharing as well.