My guess is that Canon is afraid of cannibalizing sales of their cinema cameras, like the C300.
Panasonic and Sony don't seem as worried about cannibalizing theirs, which might be a better strategy in the long run. Fuji and Nikon don't sell cinema cameras, so they have no incentive not to move fast on adding video features to their (previously) still cameras.
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My guess is that Canon is afraid of cannibalizing sales of their cinema cameras, like the C300.
Panasonic and Sony don't seem as worried about cannibalizing theirs, which might be a better strategy in the long run. Fuji and Nikon don't sell cinema cameras, so they have no incentive not to move fast on adding video features to their (previously) still cameras.