Major is currently working on the rotation and trying out new things for the server. Changes are coming soon and that means a replacement of oilrig im sure.
If you all remember, we voted in cs_oilrig
http://www.wcugaming.org/forums/index.php?showtopic=10632
It will take a little longer to get the map cycle changed once major figures out what the new rotation will be. There are also issues with the server that are hindering the process.