Airdrop will work as long as all the computers are connected to the same internet connection.
wrong...both computers can be on different connections. better yet...NO WiFi!!(internet connection) is needed as stated under the Airdrop section of this link
http://www.apple.com/macosx/whats-new/
Yes I edited my post after I quickly checked the apple site and saw no wifi is needed. Then I tried it out and it didn't work, it required wifi. But I do believe you can be on different connections.
I got this message
Image
yeah i'm wondering how it'll work without WiFi...maybe bluetooth or IR Receiver?...maybe i'll try when a friend of mine upgrades.
Okay, I did a quick test where I disconected from my wifi, but kept airport on. That seemed to work. So I'm guessing that maybe the computer connect to each other using the airport signals they send out.