This morning Geoff Keighley, the host for Gamescom's opening night live show, tweeted that over 15 game publishers and developers coming to the event are showcasing brand new content for the opening night live show. Here's the official tweet below from Keighley's official Twitter page.
More than 15 game publishers will premiere new content and make announcements during @gamescom Opening Night Live. An exciting show is coming together for Monday, August 19! Hope you get to tune in and watch the stream!