Moonbase2 conducted a podcast interview with Michael Bell who was the voice of Duke and among others in the original G.I. Joe cartoon series in the 1980's. During the interview, Michael dropped a bomb that he has auditioned for the voice of 'General Hawk' for a brand new 26 episode run of G.I. Joe. No other information was given about the show or any other characters so we will have to wait and see what Hasbro may soon tell us. You can download the podcast MP3 at the link above and the information can be heard at the 25:15 mark.
Michael Bell also goes on to mention what it was like doing the G.I. Joe: The Animation movie, working with other people and how he felt about the G.I. Joe: The Rise Of Cobra movie.