Going by their recent comments from the Reddit AMA:-
http://www.reddit.com/r/PS4/comments/27ar1y/we_are_guerrilla_games_ask_us_anything_well/
Seems like it'll be quite a while before they decide to show it.
http://www.reddit.com/r/PS4/comments/27ar1y/we_are_guerrilla_games_ask_us_anything_well/
No, we won't be showing it right now. Simple reason: we are confident enough in the game, but it's not something we can show and expect reasonable feedback. There is simply a lot of work that we need to do before we show it to our fans.
Seems like it'll be quite a while before they decide to show it.