From the video description:
Join a global celebration on October 26th as we kick off the highly anticipated launch of Halo 5: Guardians with Halo 5: LIVE, a 6-hour live broadcast streaming exclusively on YouTube. The broadcast is jam-packed with exclusive gameplay reveals, celebrity appearances, live interviews with 343 Industries, special tune-ins from around the world, and much more. Halo 5: LIVE begins at 6PM EDT on Oct. 26 and culminates at midnight when Halo 5: Guardians goes on sale in North America (show time is 3PM - 9PM PDT)
So, if whatever store you're waiting in line at has free wifi, maybe you can watch this on your phone instead of talking to your neighbor.