The X-35 fleet is heading to Aarhus in 2011

click on the ISAF link below and you will find an article about the venue for the X-35 Worlds in 2011: For the first time since being given international class status in 2006 a X-35 World Championship will take place in Denmark.´

http://www.sailing.org/30002.php

the dates for the X-35 Championships 2010 are finally confirmed as well:
 
Europeans: 15-20 June 2010 in Medemblik/Holland
 
Worlds: 29 August - 5 September 2010 in Scarlino/Italy