Here is an updated list (with pictures courtesy of digicame-info) of the upcoming Olympus lenses:
Olympus 30mm f/3.5 macro lens
Olympus 25mm f/1.2 lens
Olympus 12-100mm f/4 lens
Expect the official announcement around September 20th - the start of the 2016 Photokina show. A detailed list on what to expect from Olympus art Photokina can be found here.