Olympus just released a video teasing a new line-up for OM-D series. The 18 second video shows a photographer taking shots of a variety of sports - american football, swimming, volleyball. The video also shows quick cuts of the camera and sometimes out of focus - but we can clearly see that the camera has a vertical grip.
The sport-orientation and the professional-style grip would be consistent with the recent leak of the OM-D E-M1X (courtesy of PetaPixel) which also features a built-in grip.
The resemblance is uncanny - take a look at some shots from the video.