Typically, something has to be moving to make a sound. The camera has no flash, so the charging sound won't be there like on the 7D.
When you half press the shutter, things in the lens move, the AF, IS, and aperture, but only the IS and AF(AI Servo) are moving. The camera has a mirror motor and shutter motor that might be defective as well.
To narrow things down, turn off IS on yout lens and try it. Leave it off, and turn off AI Servo or set lens to mf, and try again. Turn the camera to Av and set the aperture to wide open, so it will not try to stop down, and try a third time. Then, try with a different lens.
Its entirely possible that the shutter or mirror motors have issues too. I'd try it with mine, but my hearing is poor, so I do not hear even loud high frequency noises.
Keep after it, until you know what's happening. You might have to return it, and have a limited time to do that. Don't count on Canon Service to have parts to fix it, just exchange it if it comes to that.