Ratchet & Clank: Tools of Destruction was pushed back by Insomniac for 1 week to release on the 30th October in the US. This was so they could thoroughly check the game and make it as perfect as they could before it went to print. We know that the game has gone gold now, and there are now signs that it may be releasing on the 23rd October.
*Edit* It's appears that the game will be shipped on the 30th October as originally planned, since an Insomniac employee has posted on the gaming forum Neogaf that "If the game ships to you next week from one of the sites you guys are discussing, that'd be news to us here. Still the 30th." Further evidence to support this date is that the review embargo for the game is lifted on October the 26th.