one of the telecasts post-race said Webber had gone to fuel saving mode that lap, while Vettel had 1 more lap at full power (he'd saved some fuel behind Mark), which is why he could get the extra accelleration out of the corner....
Did you see the post race press conference? While Button was talking to microphone, Hamilton and Webber were talking. Hamilton mimed theat from his view (behind Vettel), it looked that Vettel pulled alongside and turned right. Mark just nodded....