We still don't know if the Oculus Rift will be launching this year, or if it does launch we could face low units, but when CV1 (Consumer Version 1) launches, we should expect something magical.
According to Sean Halloran, or @Comic_Seans on Twitter, a game and software developer at Myomo, in Cambridge, MA - the Oculus Rift CV1 will feature an integrated DAC and built-in headphone port. He noticed the details in the documentation of the Oculus Audio SDK, which has now all but confirmed the use of the integrated DAC and headphone port.