Asking the question again doesn't change the answer.
http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/8a676a77ecb85f4d
"There are the fonts on the map tiles that cannot be changed."
So: No, you can't change the fonts of the text on the map tiles.
(I can't imagine why you want Comic Sans anyway, but that's an
entirely different matter :-)