The music for the third trailer is not included on the soundtrack. This is probably because it was not composed by John Williams, though it does feature new arrangements of themes composed by Williams. John Samuel Hanson and Frederick Lloyd were among those who composed the music for the trailer.
Here is the music-only version of the trailer:
According to this article the music-only version was released by "Disneyland".
Interestingly, the music for the first and second trailers were also not included in the official soundtrack, even though they were composed by John Williams. Williams hardly ever includes music he wrote for a movie's trailer(s) in his soundtrack album. The notable exceptions are his soundtracks to Harry Potter and the Sorcerer's Stone and Hook, both of which have the trailer music at the beginning, entitled "Prologue".