The Shellmap is the map you see in the main menu, when the game has started. If you have your graphics on low there wont be an animation and you cant see the difference (I guess you just have the picture of Khazad- Dum?), but if you set your graphics on high quality, there should be the animated shellmap. In the launcher you can choose between Moria, the one from BfME2 and the one from BfME1 I guess...