Sony’s President of Worldwide Studios, Shuhei Yoshida, has confirmed via twitter that purchasing a game remotely for the PS4 will automatically wake up the console to download the game, and then turn off when completed. Currently, the PS3 needs to be scheduled to wake up at a certain time in order to automatically download queued content.
In response to tweet from @SyriasSerj, Yoshida said the following:
@SyriasSerj When you buy a PS4 game on smartphone, it will wake your PS4 up to start downloading the game. PS4 goes back to sleep after that
— Shuhei Yoshida (@yosp) August 27, 2013
The feature means you can buy any game while away from home, and have it downloaded and installed waiting for you by the time you get home.