An update: According to Chanel, "Please note that Karl Lagerfeld is the Creative Designer of CHANEL and has a long-term contract with the company. Replacing him is not an issue." Tommy Ton followed up with a tweet, "Here's a clue: view the Style.com Paris videos and see if you can figure it out. Tehehehe :P"
Another update: It was all a prank! Riccardo Tisci punked Tommy into believing some fake rumor (revealed through Tommy's latest tweet). Now, how can we get those few minutes we spent thinking about all this back?