During Microsoft's E3 press conference yesterday Dead Rising 4 was officially announced, however when this happened the game was given a vague holiday release. As fast as this has come and been announced the game received an official release date, and this came a lot quicker then expected.
Dead Rising 4 will arrive on December 6th releasing around the same time as other big hitters such as South Park: The Fractured But Whole, and even Kingdom Hearts 2.8. Both of these games will be released past a major holiday sales period which could hurt the games sales, but again this falls before Christmas so it could be fine. Either way this will be a huge Xbox One and Windows 10 release, and hopefully this release date will still reflect in sales.