Geoff Kieghley has teased that Activision and Infinity Ward will be joining him on stage at gamescom Opening Night Live on August 19 at 11AM PT. In a tweet, he stated that Infinity Ward will be making a special announcement about Modern Warfare during the stream, but didnt state what it is as of now.
Source: N4G PC Infinity Ward has special announcement about Modern Warfare at gamescom