It’s interesting, but I would prefer a sEMG interface over an EEG one, so that I could actually physically control the tail.
Also, am I reading it right in that it keeps track of where you are and posts that on the internet? (that's a bit creepy). 
That's probably only if you install the app, which hopefully wouldn't be required for the thing to function. We're in such a connected world, I'm not all that surprised by it. People already will post fairly detailed logs of where they have been and when via facebook or twitter posts, if they enable geotagging. I've turned that feature off for all my apps...
I do think the concept is neat. But I would like to see a slightly more realistic movement. It looked to me like the tail is just one servo at the base that swings it back and forth, relying on the inertia of the tail itself to make it look more-or-less natural as it swings. The result is something that actually doesn't look all too bad when it is swinging faster. But when it was 'idle' and just kinda wagging slowly, it looked pretty unnatural.
Similarly, I'd be worried that any ears would have fairly unnatural movement as well. The complexity of the movements that animal ears make is so much more than that of even a tail. And you could still pretty much only show happy/indifferent/sad emotions with this. I'd rather have ones that'll also move with what I'm focusing on listening to as well.
