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The PlayStation 4 is "region free," according to Sony Worldwide Studios president Shuhei Yoshida. At Monday's E3 conference, Sony announced its new console will launch at $399, and comes with "no restrictions" on used games. Afterwards, Yoshida took to Twitter with the extra bit of PS4 news.
It's unclear if Yoshida's statement indicates the PS4 will be region-free in the same way the PS3 is. The PS3 can play game discs no matter which geographical region they're tied to, minus the sole exception of Persona 4 Arena. There are region-based PlayStation Network restrictions when it comes to downloadable games on the PS3.
-Source