Contador isn't going to trouble the GC, but the damage he could do when he inevitably picks a stage and goes on the offensive could be interesting, if Sky are forced to chase his break and others e.g. Chavez try to capitalise.
Can't see anyone but Froome winning it, bar crashes or bad luck. The team is as strong as it was in July and the contenders (bar Chavez, who I think looks great) aren't as good.