The HAF932 is a case.
It doesn't come with anything.
Most motherboards (which you would put in your case), have built in sound though.
The case does have headphone/mic jacks at the front, which will go to a standard AC'97 or HDAudio connector (or both) which will plug in to the motherboard.
Edit: with the popularity of the HAF932, there are a poopload of reviews that are easily found on google, here is one quickly if you wanted to have a good read of your future purchase: http://www.motherboards.org/reviews/hardware/1808_1.html