CameraLabs published the full E-M1II review. This is actually one of the biggest review Gordon has ever written and he concludes:
The Olympus OMD EM1 Mark II takes the popular weatherproof Mark I, deepens the grip, adds twin memory card slots and employs the most generous battery of any mirrorless camera. It improves the already amazing stabilisation, adds a minor boost in resolution and offers a cunning composite mode which under the right conditions can increase the resolving power up to 50 Megapixels.
The major upgrades though concern video and autofocus. The EM1 Mark II shots great quality 4k and Cinema4k video which work a treat with the stabilisation, while a new embedded AF system can genuinely track moving action at up to 18fps; switch to Single AF and it’ll even shoot up to 48 RAWs at 60fps. It all adds up to a supremely confident and capable camera that can capture images where others can’t, but you’ll really have to need the 4k and or burst capabilities to justify the professional price tag. There’s a lot of very compelling rivals for the same or less money. But if you’ll exploit the feature-set, the EM1 Mark II becomes one of the most powerful and desirable cameras in its class and justifies its asking price regardless of format.