If I use Apple Tv as a separate display on Mavericks will it transfer sound I want to get an apple tv, so I can wirelessly use my tv as a separate monitor, now with mavericks I know this is supported. I was wondering if this means I can also transfer any sounds from my computer to my tv, otherwise it's sorta not worth getting.
AirPlay mirroring sends video and sound to the connected device.

You can over-ride the sound if needed by selecting an alternate output as well as just send sound to any AirPlay receiver as well.

This is how AirPlay has worked since it started with sound and the video mirroring support keeps adding features as time goes by.