Tarja's official website revealed the musicians who'll be supporting Tarja in the American tour:

Mike Terrana (MASTERPLAN, SAVAGE CIRCUS, ex-RAGE, YNGWIE MALMSTEEN) - Drums
Christian Kretschmar (SCHILLER) - Keyboards
Doug Wimbish (LIVING COLOUR) - Bass
Julian Barrett (BARILARI) - Guitar
Max Lilja (HEVEIN, ex-APOCALYTPICA) - Cello

The South American tour will happen in Brazil, Mexico, Colombia, Peru, Bolivia, Argentina and Uruguay.