The first update from kickstarter implies that the Morgana mists can cause combat to begin at closer ranges than on the open sea. it also seems to directly imply that the mists hamper aircraft maneuvers.
to quote the update. "The scout planes are color-coded red because scouting in the clammy miasma is more difficult than usual. For the same reasons, our carrier strikes may be impaired." So it seems that direct interference from the mists is canon, at least in some capacity.
Here's the link if you want to double check my thoughts, it would also be appreciated to have a second opinion.