Sony Worldwide studio boss Shuhei Yoshida made the claims in an interview with The Guardian, and compared the PS4 to the PlayStation Vita.
Gallery - PlayStation 4's new camera and DualShock controller in pictures:
Copyright: Sony Computer Entertainment"We're shifting our platform more and more to the digital side. PS4 will be similar to PS Vita in that every game will be available as a digital download, and some will also be available as a disc," said Yoshida, before revealing plans to introduce multi-tiered subscription models.
"The Witness will be a digital release and because of the flexibility of the digital distribution scheme, we can have more small games that might be free or available for a couple of dollars, or different services like free-to-play or subscription models.
"As more and more services and contents become available digitally, we'll have more of an option to create attractive packages.
"So hypothetically we can look at different models - like a cable TV company.
"We could have gold, silver or platinum levels of membership... We can do subscription services when we have more content - especially now that we have the Gaikai technology available.
"With one subscription you have access to thousands of games - that's our dream," he added.
Unveiled last week, the PS4 has been compared to a "supercharged PC". It features an x86 CPU, enhanced PC GPU and 8GB RAM.
New first-party games include Killzone Shadow Fall, Knack and Infamous: Second Son.
Sony has since opened official websites for the PS4, which contain trailers, images, specifications and more.
> Read Digital Spy's ongoing coverage of PlayStation 4
Watch a trailer for The Witness below: