You can thank Mojang for the fog. In their usual infinite wisdom they have changed things for the better. The fog is now linked to the server render distance. At this time the only way to change the fog limit is increase the render distance, which leaves vanilla servers with very little options.
Note: Mojang are copping a lot of social media flack over the fog so hopefully this becomes a disable option in a future update.
Note: Mojang are copping a lot of social media flack over the fog so hopefully this becomes a disable option in a future update.