It has just been announced that the California Supreme Court will hear the legal challenges to the recently passed Prop. 8.  The justices voted 6-1 to review the lawsuits.  Various civil rights, and LGBT groups, have filed suit against the state regarding Prop. 8 arguing that it is a revision to the constitution, thereby requiring legislative approval.  A hearing is scheduled for mid-March of 2009.

State supreme court to hear challenges to Prop. 8 -- San Francisco Chronicle

Prop. 8 marriage ban goes to supreme court -- LA Times

Court order -- Supreme Court of the State of California