Mobile is primarily different from Desktop in that the little annoyances are too much for the form factor and use cases. And indirect pointing and clicking just doesn't cut it in mobile.
Wearable will only be more extreme this regard.
EEG or other electrical signals are scrambled in the skull, bouncing around inside, making discovery of origin impossible from the exterior. The best we can do is binary on or off, which is how the emotiv device works, along with detection of facial/other head muscle movements.
MRI can detect origin of signal, but the machines are huge, like the size of a car; and power hungry, and crazy expensive, and the resolution is something like one minute per signal.
Sorry to be a bummer ;) I want to see brain-computer interface as much as anyone.
They're riding the wave of hope that voice controls have now, maybe I'm naive but it's going to have to improve by miles for anything beyond novelty use.
I could see this focusing on a tighter use case, like content aware eye mounted cameras with social features, and why not two of them for stereoscopic?