However, if you read down to the end of the article there's an official quote from a Coronation Street spokesman saying: "Katherine Kelly is committed to Coronation Street to the end of 2011. It would be premature to discuss the departure of any actor when they still have almost 12 months to go on their contract." Indeed.
Mind you, it's not the first time this story's done the rounds on t'internet and as they say, there's no smoke without fire, so perhaps she will leave when her contract expires. Who knows?