PlayStation Vita will only work as a PS4 controller if support has been specifically added.
Sonys PlayStation Vita handheld will not work as a controller for all games on the PlayStation 4.
Responding to a question on Twitter, Sony Computer Entertainment president of Worldwide Studios Shuhei Yoshida said that the PlayStation Vita will only work as a controller on the system if the game's developer has specifically designed the game to take advantage of the device.
"@InsideEddie Hey BRO! In a normal sense, no. Unless a game is specifically programmed to allow such use of PS Vita," he tweeted.
Reports earlier this year suggested that Remote Play functionality would not require additional engineering to make PlayStation 4 games work on the Vita. While slightly different from using the Vita as a controller for the PS4 system, all games, except for those that take advantage of the PlayStation Eye or PlayStation Move peripherals, are believed to include native support for playback on the company's portable hardware.