Though he hasn’t heard anything from Lucasfilm, Frank Oz would be willing to return to voice Yoda, according to Hero Complex. But don’t expect another puppet version:
“I think it depends on the story, but I think at this point you can’t go back to the puppet,” he said. “The reason George [Lucas] did the CGI, which I supported, was that he wanted to tell a story that would have been hampered by the physical limitations of the puppet.”
However, remember that while it’s been confirmed that there are spin-off plans in the works, the Yoda film is still just a rumor.

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