Update: Sony has officially announced the game.
It appears the rumors were true. A new God of War game is coming to the PS3. However, it's not exactly God of War 4. An all-CG teaser trailer for God of War Ascension has leaked onto the web, and you can watch it right here.
BOOM video 12558
Perhaps acknowledging the leak, Sony Worldwide Studios president Shuhei Yoshida simply uttered one word in a tweet: "sigh."
Sony's initial tease pegged an April 19th date. It's likely this trailer will be "official" tomorrow. Stay tuned to Shacknews for the latest.