Wow, is that list WAY off (Three where right)
Alot of false cast listings where floating around the net, the proper cast is as follows (Taken from the Anime News Network, the authority when it comes to things like this). Before I begin, I would like to state this format I will put this in:
Character Name - Voice Actor/Actress (Noteable Previous Roles, if any (the more roles, the more experience).
Here's the cast, officially released by Viz:
Haruno Sakura - Kate Higgens (Zefiris in Scrapped Princess).
Uzumaki Naruto - Maile Flanagan (Matthew in Astro Boy (2003).
Uchiha Sasuke - Yuri Lowenthal (Haru Glory in Rave Master).
Hatake Kakashi - Dave Wittenberg (Sora in .hack//SIGN (Aswell as the video games), Saito in Ghost in The Shell: Stand Alone Complex, Fujiwara Takumi in Initial D, Kusanagi Kei in Onegai Sensei and Onegai Twins (Which is odd, because to my recollection, Kei never speaks in Onegai Twins o_O;).
Hyuuga Hinata - Stephanie Sheh (Harmonia and Melodia in Rave Master).
Tsunami (Inari's Mother) - Cindy Robinson (Various roles in Marmalade Boy and Great Teacher Onizuka (Julia Murai, for one); Katelya in Rave Master).
Yamanaka Ino and Konohamaru - Colleen O'Shaughnessey (Takenouchi Sora in Digimon Seasons 1 and 2, aswell as a few movies; Genis Sage in Tales of Symphonia (Video Game).
Sarutobi Asuma - Doug Erholtz (Balmung of The Azure Sky in .hack video games; T.K. in Digimon Season 2).
Gato (The man trying to stop the bridge construction in the Wave country) - Fred Tatasciore (No know previous roles)
Tazuna - Kirk Thornton (Jin in Samurai Champloo; Orca in .hack series; Brandon Heat/Beyond The Grave in Gungrave; Various roles in Great Teacher Onizuka (Including Danma Ryuji and Kikuchi Yoshito), at least a hundred roles credited, various major ones).
Iruka - Quinton Flynn (Isaaru in Final Fantasy X and Final Fantasy X-2; Spike in Gungrave: Overdose; Raiden in Metal Gear Solid 2: Sons of Liberty).
Akimichi Chouji - Robbie Rist (Takeuchi Itsuki in Initial D).
The Third Hokage (Sandaime; Sarutobi) - Steve Kramer (Terry Sanders in Mobile Suit Gundam: The 08th MS Team; various other anime roles, mostly bit roles).
Momochi Zabuza - Steven Blum (Sanjuro and Wiseman in .hack series; Spike in Cowboy Bebop; The Laughing Man in Ghost in The Shell: Stand Alone Complex; Makoto Shishio in Rurouni Kenshin; Kazuma in s-CRY-ed; Mugen in Samurai Champloo; various other important anime and video game roles).
Shikamaru Nara - Tom Gibbas (No known roles).
Thats all that Viz released, so its official.
Still have to wait and see if it goes good. I heard a short clip of Naruto's voice and it sounds ok. Ill have to hear it and see it to see if I like it though.
Hope it doesn't get the One Piece treatment.