Today at Gamescom, Blizzard had a lovely presentation, which you can see in its entirety courtesy of Blizzplanet. But since this presentation video is mostly in German and of the "skaky cam" variety, you may want to pass on it and instead watch these direct feed videos of the new content that was announced.
First and foremost is the announcement and release of the new Busan map for Overwatch. It's a new Control Point style map that you can actually test for yourself right now by downloading and installing the Overwatch PTR through the Battle.net launcher.
In addition to this new map release, Blizzard also showed off an all-new animated short today. The short is for none other than D.Va.