The “confirmation source” isn’t from the usual corporate executive. It came from one of the music composers. Timothy Williams, known for working on the scores for Watchmen, 300, and games like Army of Two has both listed and confirmed to Joystiq that he is indeed producing music for God of War IV in conjunction with the main composer, Tyler Bates.
Meanwhile, Sony gave out the usual “we don’t say anything on rumors and speculation”. We’ll keep you posted.
Source:
Joystiq
That sounds like good enough proof to me! 😆