Elijah Wood and Robin Williams are currently in negotiations to reprise their roles as “Mumble” and “Ramon” respectively.  The 3-D follow up to award-winning Happy Feet is once again being directed by George Miller, and securing Wood and Williams would certainly give the film the continuity needed for a successful sequel.

Miller wrote the new script, whose details are being kept on ice. Animal Logic again is producing the animation.

The actors will travel to Australia in late January/early February to record the voice tracks.

Robin Williams will once again provide his distinct voices for characters Ramon and Lovelace in Happy Feet 2

Source(s):
Two return for ‘Happy Feet’ sequel [The Hollywood Reporter]