"Arrests were made at a number of homes in Auckland, New Zealand, on warrants issued by US authorities. ...... If found guilty of the charges, the accused Megaupload executives could face 50 years behind bars."

As NZ don't imprison anyone for 50 years, I suppose that would mean extradition to the US. I doubt that copyright infringement would be an extraditable offence anyway, but there's always extraordinary rendition.