The new Olympus E-M1III has been added to the FT matching simulator. This lets you see all possible camera+lens combinations.
And also CameraSize added the camera and lens to their comparison tool:
Preorders:
E-M1III at Amazon, Adorama, BHphoto, GetOlympus. Olympus DE. Olympus UK, Olympus FR, Olympus ES, Olympus IT, Olympus NL.
Olympus 12-45mm at Amazon, Adorama, BHphoto, GetOlympus.
Olympus E-PL10 at BHphoto.