If anybody does a search, you will find that Wilson and Fed went through many molds to get "it right". I personally don't believe it is the previous racket with a new pj.
You're absolutely right. Federer did help to design his current racquet and he probably did go through many molds and prototypes. However, all of this happened in 2002 when he switched from the PS 6.0 85 to his current racquet. He's been using the same racquet ever since.