AirDrop will work with stock wireless hardware in these machines. It's Continuity and the more advanced features that require Bluetooth 4.0, which actually CAN be resolved by using a BT4.0 USB adapter. What I mean by "no upgrade options" is that the internal wireless hardware cannot be upgraded.Even with dongles for the 13 inch? Is it because of the wifi being incompatible too? (before i changed my 2010 15 inch with a bt/wifi card, i did get Airdrop working with a USB BT dongle)