The Australian Office of Film and literature classification has revoked the classification for Grand Theft Auto: San Andreas as a result of the Hot Coffee modification:
The Classification Board made this decision on the basis that it contains contentious material (activated through a code or otherwise) that was not brought to the Board's attention when it was classified.
"Contentious material" is defined in the Classification (Publications, Films and Computer Games) Act 1995 to mean "... material that would be likely to cause it to be classified ... for a computer game - M or a higher classification".
Their press release
(PDF) has more information. The release also states that retailers should be removing the game off the shelves immediately and that parents should "exercise caution in allowing children continued access to the game".