When I updated my map, old borders are still where they were before, but when you highlight, pick, or capture one of the countries I edited, its new limits will be highlighted, while still showing the old borders. (this is in map previewing and playing)
In the photo, you can see that when I highlight the Sichuan region, it highlights the new extent, but shows old borders http://s1083.photobucket.com/user/dylansmigel/media/fffff_zpsfxneo4cd.png.html?sort=3&o=0