The specific launch date and specs of the new lenses are still unknown. But the main improvement should be the autofocus performance.
Note: Now you can get $100 instant savings on Sony 135mm f/1.8 Lens and Sony 85mm f/1.4 Lens.
Read more: Sony Alpha Rumors
Note: If you are a Sony Camera User, you can now join the Sony Camera Users Facebook Group to share your Sony photography and advice, ask and answer questions that arise and help each others!
Sony Camera Users: https://www.facebook.com/groups/SonyCameraUsers