We used to have associate deans for humanities, social sciences, hard sciences. Now we are going to have associate deans for "academic innovation and student success" and things like that. This means that we won't know them as well, because they are not in charge of various sets of departments, but of broadly defined conceptual values. There will be one for diversity, maybe one for sustainability.
I see this as part of the trend toward emphasizing less academic functions of academia, though the dean is making these positions 25% ones rather than 50 to save money. So the dean will do as much work, probably, but be paid half the amount for the administrative work sh/e does.