I don't like it A) because I'm not a helmet wearer and B) oddly, its indicators don't appear to be visible from the front.
(Nor did I like the tone of the opening paragraph here >
http://www.dvice.com/2013-2-26/dora-bike-helmet-comes-built-turn-indicators )
A lot of cyclists are festooned with blinking LEDs, making it difficult for others to interpret them as mere markers or something that tells others of their intention to change direction.
I don't think drivers associate flashing lights on a bike as any form of indicator and adding a set of lights to a helmet won't make things any clearer, particularly when the head moves around so much with shoulder checks etc.
I'll stick to good old-fashioned, clear arm signals and proper positioning.
GC