The head of Sony Computer Entertainment America has confirmed on Twitter that the PlayStation Vita will be region free, much like the PlayStation 3.
In a direct response to a user on Twitter who asked if Vita was region free, Shihei Yoshida said "Yes, it is." You can't get much clearer than that.
The PlayStation Vita has been confirmed for release on the 17th of December in Japan and will retail for an equivalent price of $325. With it being region free, anyone from any region will be able to import.