I see Silva winning this "P4P Championship" Superfight.
During Machida VS. Jones, Machida was getting the better of the match up until Jones decide to take him down. In term of speed, Anderson Silva hands is even faster than Machida. Along with his 1 punch Knockout power, he will own Jones in the stand-up department easily despite the reach advantage Jones enjoy.
But should and when Jones decide to take this fight to the ground, that is when things get interesting. Anderson Silva definitely has a improved TDD evidence from the Silva/Sonnen 2. Plus with him training for Weidman now, he might even have improve his TDD further.
So is that enough to stop Jon Jones from taking him down? The answer is no. But he have pretty damn good ground defense even if he is being taken down. And he will probably be more active on the ground trying to work for a submission than Machida which will make him a threat everywhere.