Speaking to CVG, director Nate Fox explained that Ellis was chosen to voice protagonist Cole MacGrath because motion capture work was required for the follow-up.
"We got a new actor primarily because we were capturing action and audio at the same time," he said.
"The old Cole was just a voice actor and since we're starting motion capture work we wanted to get someone who had the physicality and the voice, which we get simultaneously so we have more nuance in our performance."
Explaining the character's new look, Fox revealed that the sequel's improved technology will allow the development team to render a full head of hair for Cole.
"Part of the reason Cole had a shaved head in the first game was because we didn't think we could do a good job of rendering hair very well on the main character," he added.
"Now we have better technology and we can give him a sweet head of hair - and Lord knows if I could grow out my hair I would do it."
InFamous 2 will be released for PS3 in 2011.