Zeiss N lens manufacturers



I'm very interested in the new Contax N series. My question is, that only Carl Zeiss is the one, who constructs N mount lenses, or there are others? Are there other manufacturers, who are planning to do it?

And what do you think about the future of the N system? The incompatibility whit the old lenses is a failure, or the old users will switch to this new world soon?