Wow, this appears to be an actual switch. I actually think this is awesome. So many of the Wilson diehards swear by the fact that Babolats are cheap crap, then you have one of the best players of all time (who was basically the face of the PS85 by and large) going from a custom-designed-for-him Wilson, to what appears to be a stock (but surely modified) Babolat.
As I always like to say, results matter! Babolats are great racquets.