Pirelli's new contracts are in fact for a longer-than-expected six year period.
It appears that Michelin has been preparing to return to Formula One
At Spa-Francorchamps rumours again surfaced regarding a possible change of a tyre supplier
Media reports said the Pirelli investigation had allayed the nervous drivers' fears, but it hasn't stopped rumours Michelin is poised to return to F1 to replace Pirelli in 2014.
Marc Surer, a prominent German-speaking commentator, said alternate marques like Michelin and Bridgestone could enter F1 "at short notice" to replace a departing Pirelli "if they wanted to".