With a resolute, “No,” on Twitter, President of Worldwide Studios for Sony Shuhei Yoshida confirmed via Twitter the PlayStation 4 will not allow external storage devices. By comparison, Wii U is designed around such functionality, and while Microsoft’s competing Xbox One will offer the option, it will not be available at launch.
PlayStation 4 units come stocked with 500GB of internal memory. Sony’s push for digital content and personal game recording sessions could burn through said space rapidly.
While this seems like a mistake, both PlayStation 3 and Xbox 360 morphed into vastly different consoles as they stretched lifespans. Sony could push for such a feature via firmware or hardware remodel later in its life. It’s not as if players will fill 500GB at launch.