Many U.S. Immigrants’ Children Seek American Dream Abroad

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In growing numbers, experts say, highly educated children of immigrants to the United States are uprooting themselves and moving to their ancestral countries. They are embracing homelands that their parents once spurned but that are now economic powers.

Some...had arrived in the United States as young children, becoming citizens, while others were born in the United States to immigrant parents.

Enterprising Americans have always sought opportunities abroad. But this new wave underscores the evolving nature of global migration, and the challenges to American economic supremacy and competitiveness.

In interviews, many of these Americans said they did not know how long they would live abroad; some said it was possible that they would remain expatriates for many years, if not for the rest of their lives.

Their decisions to leave have, in many cases, troubled their immigrant parents. Yet most said they had been pushed by the dismal hiring climate in the United States or pulled by prospects abroad.

FULL: http://www.nytimes.com/2012/04/16/us/more-us-children-of-immigrants-are-leaving-us.html?pagewanted=all

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1. In that article, they admit they don't have statistics

Or claim they have them without citing them.

So there's no proof of any "new wave" of this happening, just some anecdotes.