Sony is rumored to announced a new 55-150mm f/2.8 G lens for Sony NEX E-mount cameras. It will be announced along with the new NEX ASP-C cameras and the 16-xx mm zoom lens in September, 2013. And starts shipping in October-November.
This 55-150mm f/2.8 G lens would be the first high quality and fast mid range zoom for the NEX system. Price of this lens is not available yet.