they took it apart but they didn't mention whether the HD is soldered in, or whether it looks replaceable. For me, the option to upgrade to SSD in 6 months and save $600 is a plus.
Aagh! You make me turn into The Incredible Snark!
Now I know that the people who put up that album are guilty of the cardinal sin of putting up three pictures when one would tell the story (I'd hate to sit through their vacation photos - "and here's another shot of me in front of the moscone centre") but your answer can be found in fewer clicks than the keystrokes it took you to ask!
I'll reduce it to a single click for you... you're looking for something that looks like a Phillips screw next to a metal boxy thing that says "HDD" on it.
"... and here's another shot of the MacBook Air, this time with my right hand resting lightly on the frame..."