I mean, James Earl Jones used that much?
Holy ****, that was actually him? I just assumed it was a sound alike.
Yup, that's him! Anthony Daniels also reprised his role as C-3PO in the series, as well as Billy Dee Williams as Lando Calrissian (twice, now, and word is a few more times in the queue), and even Frank Oz coming back to do Yoda's voice.
They've done a pretty good job bringing back the original voices, when possible. (I think the only voiceover theoretically possible that they haven't used was Ewan McGregor as Obi-Wan Kenobi, but....eh, he was only in 2 movies, and James Arnold Taylor was Obi-Wan in 6 years of the Clone Wars, so...works for me)