Adam Boyes (man that business card must be long) is interested in making an Early Access-style program for PS4 developers, according to a recent interview with Gamasutra.
When asked if Sony was considering making a game available while said game was still in development, Boyes responded, "That's one of the massive conversations we have internally; that, at what point does [a game meet standards of release]? We still at some point ensure that we're being mindful of the consumer. We don't want somebody to stumble across that title and expect a full product, and have a negative experience."
"We're figuring out what's ok," Boyes added. "We obviously have our tech requirement checklist that people have to adhere to. So we're internally discussing, what does that list look like? What are the caveats? Stuff like this. So it's still a project that a lot of minds are considering. No details yet, but it's something on the top of my mind every day."
In other words: no early access for Boyes' vision of early access on PS4. At least for now.