As confirmed by Shuhei Yoshida, the PS4 will be region free. Yoshida, Sony Computer Entertainment Worldwide Studios president announced via Twitter in a short but sweet message, “And yes, PS4 is region free”
And yes, PS4 is region free 😀
— Shuhei Yoshida (@yosp) June 11, 2013
The PS4 being region free was mentioned earlier by Brad Douglas of Sony, who stated via Twitter as well that the system would not be locked.
@feitclub SCEI PR tells me “no region locking”.
— Brad Douglas (@kazamatsuri) June 11, 2013