According to CVG, Amazon once again was the source of a significant leak when they posted the box art for what we now know is God of War 4 for PS3. On their official blog, Sony later confirmed the news. Entitled God of War: Ascension, Sony has an official reveal event scheduled for April 30.
"I’m sure your mouth is watering for more, but unfortunately I have to leave you with that for now. Be sure to tune in to PlayStation.Blog and God of War: Ascension on Facebook on Monday, April 30th at 8am Pacific Time for a live streaming event that will give you a glimpse of what’s in store for God of War: Ascension. I’ll also be answering your questions about the game, so follow @[member='playstation'] on Twitter and Tweet us your best questions by 3pm Pacific Time this Friday — be sure to include #godofwarascension in your Tweet so we can find it (we’re expecting a lot of questions!) If we pick your question to ask during the show, we’ll even send you a signed God of War: Ascension poster," said game director Todd Papy.
Source: CVG, Official PlayStation Blog