It would be nice to see this work on Eye-Fi wireless SD Cards.
ML not only works but also can detect when it's on an EyeFi card and will show a dedicated menu that permits (with a workaround) to transmit RAW files with any EyeFi (not only Pro).
I have it working on 600D with a Sandisk EyeFi (a special branded EyeFi for EU market, it's like a connect X2 but C4 instead of C6 looking at specs and lack of RAW support I suppose).
But there were/are some problems of compatibility between some camera models and some EyeFi models that are unsolved by Canon and EyeFi. On 600D and newer cameras they sem partially solved, but for example I can't upgrade original canon firmware with my EyeFi like i would with a normal SD card, that problem will make my EyeFi unusable for a first time installation on ML and so it also need do be made bootable from PC before being compatible with ML and Canon firmware.
So EyeFi support is working with some card and camera combinations