Trusted sources confirmed the new M.Zuiko PRO 12mm f/1.2 is going to be announced by Olympus. It’s yet not confirmed when they will announce this lens but I guess we will see it at Photokina.
Links to the current f/1.2 lenses:
17mm at Amazon, BHphoto, Adorama and GetOlympus.
25mm at Amazon, BHphoto, Adorama and GetOlympus.
45mm at Amazon, BHphoto, Adorama and GetOlympus.