This is something I pointed out when the first screenshots appeared. Now the icon size in the unit panel appears to correspond to the "2d Large" map view. I think there's plenty of room to making it bigger, at least to "2d huge" size. Thoughts?
The problem is that right-clicking on that brings up a different view, and making those huge would make life more complicated. The two views have to be the same size for the air status panel doesn't overlap it. People with 1024x768 are already having problems and that would make it worse. I may be able to do it later in a larger patch or expansion, but for now, I'm afraid, it may have to stay that way.