Need space.

We've always known that we had a window to release the game, and it's important for us to finish it the right way. We've got some margin either way, to some degree, but again I think there's a responsibility, and we don't want to deceive - so it's important for the game to be polished up until the last minute.

Also, purely from my perspective, most publishers today realize that it's not ideal to release a new IP or a new genre just before Christmas. It's a very crowded place to be, and certain games need more space to live their life. Everybody at working on the project, both at Quantic and Sony, believe this is the right time (referring to 2010).

• Quantic Dream: There's still 'a whole lot of work to be done' on Heavy Rain
• Quantic Dream: Heavy Rain not conceptually in line with Trophies, will still have support them though
  

Via GamesIndustry