Who Does The Voices of the Penquins?

Rating: Null/10 (19 April 2009)

We have checked the video, every Madagascar 2 website, Wilkipedia and all movie resources and have not been able to find the answer to the question . . "Who did the voices of the penguins?"
My wife says that the "lead" penguin's voice was done by Phil Hartman. But I thought Phil Hartman passed away in 1998. Is she correct or were they done by other's listed in the cast for their primary roles only?
We understand that there is a new film in the works with the penguins as the featured stars. Is this true? If "yes", will all of the main characters from Madagascar and Madagascar 2 be also included? What is the release date for this new film and will there be other Madagascar movies planned for the future?