At the moment, there aren't any Thunderbolt audio devices I am aware of.
You can however get FireWire to coax/AES - Weiss INT202/203
Or you can get USB2.0 to coax/AES/optical/BNC. I use a Wavelink HS which provides a BNC SPDIF output. You can also try Bel Canto REF Link which outputs AES and coax and optical, Berkeley Alpha USB, among others.
If you don't have a spare USB or FW port - like with a MacBook Air/Retina, you can buy Thunderbolt to Firewire adaptors from Apple, or a Belkin Thunderbolt dock that provides Firewire/USB3.0 ports
http://www.belkin.com/us/F4U055-Belkin/p/P-F4U055/
You can however get FireWire to coax/AES - Weiss INT202/203
Or you can get USB2.0 to coax/AES/optical/BNC. I use a Wavelink HS which provides a BNC SPDIF output. You can also try Bel Canto REF Link which outputs AES and coax and optical, Berkeley Alpha USB, among others.
If you don't have a spare USB or FW port - like with a MacBook Air/Retina, you can buy Thunderbolt to Firewire adaptors from Apple, or a Belkin Thunderbolt dock that provides Firewire/USB3.0 ports
http://www.belkin.com/us/F4U055-Belkin/p/P-F4U055/