Just tested it by smacking a few mobs.
I have the "mature" Miqo'te voice and the new sounds fit in nicely. They are pretty quiet though, oftentimes getting drowned out by weapon noises.

Oh well, if it were up to me Ifalna wouldn't battle yelp at all. That's why I love playing casters. They are focused, silent and deadly. :P

Certainly much much better than my Draenei fared when WoW added new sounds. ... She has a split personality now. >.<