Interestingly, in 16w32b, I cannot hear this. However, if I enable subtitles, then I see 'minecart rolls' in the bottom right. So the game is definitely trying to play it. Here's a video: https://www.youtube.com/watch?v=y1qa8DESjgM&feature=youtu.be
Confirmed for 16w32b. It only happens sometimes though.
Interestingly, in 16w32b, I cannot hear this. However, if I enable subtitles, then I see 'minecart rolls' in the bottom right. So the game is definitely trying to play it. Here's a video: https://www.youtube.com/watch?v=y1qa8DESjgM&feature=youtu.be