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This means when you've got reconstructed scene assigned to a 3d camera (via camera solver constraint) and applies scale on this camera from Ctrl-A menu, scale will be applied on the reconstructed scene and reset camera size to identity. This is very useful feature for scene orientation, when you'll just scale camera by S in the viewport to match bundles some points in the space, and then you'll easiy make camera have identity scale (which is needed for nice working moblur and other things mentioning by Sebastian :) without loosing scale of bundles themselves. Behavior of apply scale for cameras without clip assigned to them does not change at all.