When is call of the dead coming out for ps3 and can you tell me how to kill george?

ok so i played call of the dead on xbox 360 and it looks amazing but never caught on as to why your new survivors, why the original zombie slayers are locked in a vault door and why you face an undead George A Romero. ok so when i played it right away you have George chasing after you and he'll chase you till the end of time and he is a pain to kill so info and tips please thanx.