Shuhei Yoshida, boss of Sony Worldwide Studios, has gone on-record to confirm that PS4 will be able to play used games. Speaking to Eurogamer, he said: "That's the general expectation by consumers. They purchase physical form, they want to use it everywhere, right? So that's my expectation."

When pushed for an exact answer to the question: "So if someone buys a PlayStation 4 game, you're not going to stop them reselling it?", Yoshida replied (after consulting with his PR advisor):

"So, used games can play on PS4. How is that?"

That clears up one question from our list of 15 PlayStation 4 questions that remain unanswered.

