Brainiac Transplant?

If the trailer is any indication, Corey Burton may not be playing Brainiac in the upcoming Superman direct-to-DVD animated feature.

Now, I'm of two minds with bringing Tim Daly back to play Superman after five years of George Newburn (who has grown into the role nicely), but Corey Burton has been Brainiac since 1996. He's had ten years of fairly regular appearances as the character, even into this (apparently last) season of JLU. He's clearly still interested in the role. Why replace him?

I'm beginning to anticipate the sort of let-down I felt when David Ogden Stiers, and not Paul Williams, came out of the Penguin's mouth in "Mystery of the Batwoman."