WFT-E5A Firmware Upgrade
Supposedly (if you believe Canon tells you all there is), the only change is support for the EOS 7D with v2.0 firmware:
Firmware Version 1.0. 7 incorporates the following change.
1. Supports the firmware Version 2.0.0 for the EOS 7D which is made available on the Web on August 7, 2012.
-The Version 1.0.7 firmware being released this time is for wireless file transmitters with firmware up to Version 1.0.6. If the wireless file transmitter's firmware is already Version 1.0.7, it is not necessary to update the firmware.