If you're interested in watching the live video stream (in your lunch break?) then head to xbox.com and enjoy. Alternatively, you can watch the stream on your Xbox or with the Windows Phone app.
"Experience the best of Xbox direct from gamescom, Cologne, Germany ? Europe's largest gaming event and tradeshow! Watch the gamescom 2014 Xbox Briefing on August 12th and see the latest exclusive trailers, news and announcements from the show. Then stick with us for our After Show where we'll be taking a closer look at the biggest games and chatting with the developers," said Microsoft.