Several key iPhone developers left Apple to join Palm beginning in the summer of 2007. Even after that point, several individuals at Palm, including Ruby himself, but also lower-level individuals, aggressively attempted to recruit top iPhone developers to Palm. Most attempts failed but a few succeeded.
Steve Jobs was furious, but given California employment law, there was little he could do.
Thus, it is obvious that the Pre was influenced by top Apple recruited talent, including of course Mike Bell, Apple's former VP of hardware, with knowledge of Apple roadmaps years in advance, who took that knowledge and left for Palm. Fred Anderson, though not on the engineering side, after being made the scapegoat for the stock scandal, left Apple for Palm's board, also with knowledge of Apple plans.