While we were not expecting any new emoticons at all, at least one debuted in the 604 build of MSN Messenger 7 (currently unavailable to the public). Say nnnnnaaaaaaaaaaa-hhhhh to mister goat, the 79th default emoticon and 7th animal emoticon to be listed in MSN Messenger. Like detn8r told me, it replaces the (?) emoticon (do I hear IRC-addicts mourning?).
The non-animated emoticon, which is drawn in the same, non-typical (read: ugly) style as the sheep and turtle emoticons, can be called with the (nah) keyboard shortcut, resembling the bleating sound of a goat.

Thinking of the various meanings of "goat", I can imagine a lot of dialogues in which the emoticon could come in handy:
- Scapegoat, old goat,...
- G.O.A.T.: Greatest Of All Time (one of Muhammed Ali's nicknames)
- GoAT: Go Away, Troll (common Usenet abbreviation).
- Etc.