This answers some questions yet raises more:
For months a huge question mark has loomed over the location of 2013’s WonderCon, one of the largest comics conventions in the United States. In an exclusive interview with Comic-Con International’s v-p of marketing and public relations David Glanzer, he revealed that the answer is Anaheim—but that could change, as Comic-Con International, the non-profit organization that runs the show, may still get dates in the fall for a Bay Area show. In which case that show will be WonderCon and the Anaheim show will be rebranded an as-yet unnamed new SoCal show.
But as of right now, WonderCon is slated to be held March 29-31, 2013 in Anaheim—which also happens to be Easter weekend.
More details in the link at Publishers Weekly.