The vast majority of PS4 games will reportedly be required to support Vita Remote Play.
In February, PlayStation Worldwide Studios boss Shuhei Yoshida said he'd like all first and third-party studio partners to consider Vita Remote Play as a standard feature for future PS4 games.
But now, according to a Eurogamer development source, Sony has mandated Vita Remote Play for all PS4 games excluding those that require PS4 Eye support. We've requested comment from Sony.
UPDATE: Yoshida has confirmed today's news in the following tweet:
@mrdawe Yes, it's true unless the game requires specific hardware like the camera. It will be great to play PS4 games on PS Vita.— Shuhei Yoshida (@yosp) May 29, 2013
Vita Remote Play currently enables Vita to connect to PS3 and essentially act as a controller and a TV. Users press buttons on Vita as though it's a DualShock and the PS3 plays the game like normal, but then encodes the 'video out' as a video stream and sends it to the handheld's screen.
It's a neat feature that hasn't attracted the level of developer support Sony would have liked, but one that should be more attractive on PS4. Eurogamer's report points out that PS4 features bespoke hardware video encoding for Remote Play and screen-sharing support powered by Gaikai's streaming technology and that, because they're built into the console's operating system, developers will incur no performance penalty for using them.
Sony revealed PS4 in February, when it confirmed a PS4 release date of "holiday 2013" in at least one of Japan, Europe and the US.
The firm has yet to show off the console itself, but it recently teased plans to reveal the PS4 hardware at E3. Sony's E3 event will kick off at 6pm Pacific Time (2am BST) on June 10.