Then I'll be waiting with Spirit Tracks on hand. You could play the second file
Speaking about the commercial, if you want to analyze it even more, let me help you.
1 second in you see a man playing Pan Pipes (this is the instrument that Link will play in the game).
4 seconds in you see graffiti of the Triforce on the opposite seat to the boy.
6 seconds in you see a man reading a newspaper called the "Hyrule Times" and with an article heading that reads "Spirit Tracks Disappearing".
7 seconds in the subway routing map system turns into a map of what could be Hyrule (I won't tell you if it is or not, you'll have to find out for yourself).
8 seconds in we see Zelda's spirit leave her body (what do you personally make of this?)
12 seconds in the subway goes dark and you suddenly see all the seats and floors have been upholstered.
15 seconds in we see Zelda's spirit fly into the armor of a Phantom (what do you personally make of this?)
Then the rest of the commercial shows clips of the game (I'll let you analyze those portions if you want).
The half man/half goat creature you're thinking of is indeed called a "Faun". They also go by the name "Satyr" or "Pan" (Pan was the king of all Satyrs and he was essentially the god of nature).
I suggested it here on the forums in multiple threads:
Proof. That is the latest one that I can show you that is visible to the public (I have some really old posts, so my suggestions have dated before 2007).
-BGS