Please stop saying it doesn't. Despite it not appearing on Apple's specs page, there is no conspiracy, and Apple hasn't dropped the feature. The MacBook Pro with Retina display has the same combination 3.5mm-analog-and-S/PDIF-digital output port all other Macs have used for several years now.
Thanks to TUAW reader Patrick Perini (and his shiny new MacBook Pro, iCarus) for sending us the screenshot above, and to the Guardian's Charles Arthur for also confirming this to be true.