"IGN is going to be premiering the gameplay reveal of an unannounced Platinum game during our E3 2015 live show.
Tune into IGN at 3pm PT (6pm EST/10pm GMT) on Tuesday, June 16 for an extended look at gameplay from a new game from the Japanese studio that brought us Viewtiful Joe and Metal Gear Rising: Revengeance.PLATINUMGAMES / 8 JUN 2015
Last year, Platinum released Bayonetta 2 on Wii U. We loved the game, giving it a 9.5 and nominating it for Game of the Year. We also spent time with Platinum's Hideki Kamiya and explored his secret arcade. Platinum also revealed Scalebound during the Microsoft conference during last year's E3
Check out our full list of Games at E3 2015, as well as a thorough list of all of the E3 press conferences and events that will occur throughout the week of the show. 
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Source: http://www.ign.com/articles/2015/06/09/e3-2015-unnanounced-platinum-game-coming-to-e3
Good to hear that Platinum is showing off something new this year! Can't wait to see what it is.
