San Diego Comic con is in July. That is traditionally what is referred to simply as "comic-con" when a city is not mentioned since it is the biggest. There was the much much smaller Denver comic con last week...maybe that is what you heard? There probably would not be any scooby news out from that one since it does not have the studios presenting.
New York's CC is not till October, which more than likely would be the only other con besides SDCC that would generate any news related to scooby.