Board Thread:General Discussion/@comment-98.212.217.126-20130604134548/@comment-10390252-20130605190142

It seems that Jeff Williams wanted to write a 'Yellow' theme but Monty wanted a mix of the previous three to match with the 'Club' setting of the trailer. That said, Jeff did write a Yellow theme and it begins at around 4:20 in the Yellow Trailer when Yang and Junior go one-on-one.

As there is apparently a complete song, sung by Casey Lee, we might see it come out on iTunes in the fullness of time.