Unshō Ishizuka indeed took over the role of Mr. Satan beginning with this weekend’s episode 86 of Dragon Ball Kai. Other than briefly voicing the character in TAG VS for the PSP earlier this year, there had been no word whether it would be Ishizuka himself or someone else eventually taking the role in the refreshed TV series.
Mr. Satan had previously been played by the great Daisuke Gōri, who passed away this past January.