i have not tried the optical out directly on the xb1... i have run my dolby surround on a (out) for my tv... i guess i should try it off my xb1 and see if i get the update??
it would make no sense to me that it would only work with a headset/astros/tb... to get the update thru a plug in on the controller..
i have used my xb1 hdmi out to my tv and used the coax/aux audio output to my digital bar... games like bf4 have changed compared to convential speaker/tv speakers... but forza5 sounds the same... and really in twitch streams it dosnt have the output/digital feed like it would on personal console/game..
so if it was bundled in with the update i got it.. if i had to connect some other way than i did not or was not prompted to at any point that i connected the soundbar.
i followed this:
http://support.xbox.com/en-US/xbox-one/live-tv/connect-console-to-home-theater
Audio receiver with optical or sound bar
This is a slightly more complicated configuration that may require cables other than HDMI cables. This option provides full surround sound from your television set-top box. It’s best for older A/V receivers that either don’t have an HDMI port or don’t support audio over HDMI.
Connect your set-top box HDMI output to the Xbox One HDMI input.
Connect the Xbox One HDMI output to the HDMI input on your television.
Connect the audio output from the television to the audio input on the sound bar using either HDMI or Optical S/PDIF cables.
unless i am missing something my coax wont plug in to the back of my xb1.. i have to go directly from the tv.