I am not sure if this strictly qualifies as a competitor, but damn is it cool, slick and innovative.

http://gizmodo.com/5365299

It is still not clear as to what other capabilities it will have, other than those shown in the video, but I am finding it very difficult not to be drawn to it.

This really does seem to be an order of magnitude ahead of what we are used to.

It is unbelievable that it is coming from Microsoft too, of all people.