Siliconera translates from Famitsu. Resident Evil 6, like many other Capcom games, has English voiceovers only, even in the Japanese version.
Not that the game has suffered in Japan for a lack of native voice acting – Resident Evil 6 for PS3 is Japan's No. 5 game of 2012, selling 828,000 copies nationally last year. Capcom shipped 3.7 million copies of Resident Evil 6 worldwide in the first half of fiscal 2013, nicely padding its overall revenue for the period, though it wasn't even close to hitting our personal "best of 2012" list.