Courtesy of SonyAlphaRumors:

According to a reliable source Sony plans to update two current A-mount lenses: The 135mm f/1.8 and the 85mm f/1.4. The source did not unveil when those lenses will be announced. But the main improvement will be the autofocus performance (no change on the basic optical quality).
Good news, because the optics are killer and we just need more speed and less motor noise via new mechanism's if you ask me

My video style review of the A-Mount Sony 135mm f/1.8 Carl Zeiss T* Lens: