Thanks for the heads up on this fordan.
Couldn't find anything online about this, they are keeping quiet about it on their fb page too dispite a few people asking, called reservations and confirmed from 3rd December their will be a mandatory resort fee of $25 per night.
Bookings made before 3rd Dec will have the option of accepting the new resort fee or not.
Just made all my reservations for 2013 before this comes in, as much as I love the cosmopolitan this resort fee is going to kill it for me
Lots of LNF opportunitys about at the moment for anyone looking to book before the 3rd, check out the LNF thread.