That's what's most interesting to me. Have we heard from anybody who's actually bought the player from a vending machine? This seems to me to be one of those cases where you don't actually need to do it to get the marketing value from it- all you need is to make a video of the idea. It's a more sophisticated form of "This Ad Was Banned!!"
I could be totally wrong, of course.
EDIT: To clarify, I'm saying I don't think Sony's actually selling their walkmans in bottles of water, they just made a video of the idea of it. Can anbody disconfirm this?