I don't believe there was ever any real confirmation as to whether the Vita would be region locked or not, but Shuhei Yoshida confirmed via Twitter that it will be region FREE. He responded to a question from someone on Twitter as to whether the Vita will be region free, to which he said "Yes, it is."
http://www.gamespot.com/news/6335200.html
http://twitter.com/#!/yosp/status/114813147948384258
This is great news, as if any games that are wanted don't come over to the US, then we can just import them.












