I don't know how much you believe from Wikipedia, but here you go (if it hasn't already been posted):
Applications are due on November 27, 2007. Semi-finalist interviews are expected to be held in December 2007 and January 2008 and final casting interviews will take place in February 2008, in Los Angeles. Filming is expected to take place around April or May 2008.
April and/or May of next year, it states now. It may change in the later months, but keep an eye out on any possible changes.