It looks like Airsides 1 and 3 and Orlando Int'l (MCO) are going to be getting renovations in the near future. I came across the website of one of the contractors that includes a drawing of the new look (on the left side of the page):
Looks like they will be getting new hub areas that look similar to the newer airsides with the large skylights. The renovated hubs should make a big difference. It would nice if they could add the skylights in the wings like the newer airsides, but I would imagine such an upgrade would be quite expensive and disruptive considering renovations will take place while the areas are still operational.
It appears that Airside 3 will be the first to get the upgrades.