This is the list (In order) that the rotation is currently. If there are any issues regarding these maps please post them here: http://www.nwpublic.com/viewforum.php?f=65.
Click the map name and it will take you to the maps page, providing an image.
Custom Map 1 - Bastion Gate
Custom Map 4 - Bunker Hill
Custom map 5 - Lighthouse
Custom Map 6 - Borodino (aka "The cav map")
Custom Map 7 - Small city with estate
Fort Hohenfels - Wooden Russian Fort
Custom Map 8 - Hougoumont
Siege of Toulon - Napoleonic red brick fort
Custom map 16 - Hybrid map
Sjotofta - Default map with many changes
Avignon - Town siege