OCZ has been busy since we reviewed the Neural Impulse Actuator last summer. Fudzilla has word that the company is developing a second-generation device that will be wireless and feature a built-in accelerometer.
Presumably, the second-gen NIA will be able to sense facial muscle tension and read brain waves like the current model. The accelerometer should supplement those functions by allowing users to move sideways in games by simply tilting their head—at least, that's one use of the new feature Fudzilla mentions. Who knows, maybe you can also use the accelerometer to play awkward and potentially dangerous games of Wii Tennis.
The new-and-improved NIA will supposedly be ready "by the end of the year," and it may show up in August at the Gamescom convention in Cologne, Germany.