Sony head of Worldwide Studios Shuhei Yoshida is a gregarious, smart, talkative interviewee. And that's exactly why it was so weird that he fully waffled when we asked him to address whether or not the newly unveiled PlayStation 4 will play used games. "That's my expectation, that PS4 games will work on [the] hardware. That's my expectation," he told us in an interview this morning. When we pushed to clarify what he meant, Yoshida stuttered. "Ummm ... yeah. We have to really name our system services to explain more about it," he added.

That's a similar answer to what he told Eurogamer last night at Sony's big PlayStation 4 announcement event, vagueness and all. Yes, used games "can play on PS4," but does it require a license repurchase? Perhaps you have to belong to an as-yet-unidentified PS4 online network? It's not entirely clear, but there seems to be a caveat to the statement, "Used games work on PS4." Sony, however, isn't saying what that caveat is just yet. Of course, current-gen consoles all support buying any used, physical copies of games and playing them on their corresponding game consoles

Yoshida also confirmed that games will launch at retail as well as digital, but, well, you probably already guessed that from the included Blu-ray disc drive.