Gamescom opens in Bethesda on this year . Event is world 's largest trade fair for video games . Microsoft , Microsoft expected to show off new consoles , titles . `` Sony , '' `` Diablo '' and `` Diablo '' updates to be shown .
Gamescom opens in Germany on Wednesday . Event is world 's largest trade fair for video games . Sony , Microsoft expected to show off new consoles , titles . `` XCOM , '' `` Diablo '' and `` Dead Rising '' updates to be shown .