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During the Niconico Chōkaigi 3 Convention in Chiba (Japan), the creator of the Dragon Quest franchise, Yuji Horii, said the next title in the series is in production by Square Enix.
Horri did not say that the next title is really going to be Dragon Quest XI, but because he mentioned SE is “making the next” one, people assume he is referring to a sequel in the series, in this case, DQ XI.
What seemed unexpected was the reaction by noth Dragon Quest X producer Youske Saito and chief planner Anzai Takashi. It seems as though the announcement by Horii was not supposed to be said yet, according to the post in the FC2.com blog, reported in English by Gematsu.com.
[Source]: Gematsu: The next Dragon Quest game is in production [http://gematsu.com/2014/04/next-dragon-quest-game-production] via @Gamenohanashi at FC2.com Blog: 『ドラクエ11』？堀井雄二氏『DQ10』のイベントで「次を作っている」とぽろりした模様 [http://remoon.blog15.fc2.com/blog-entry-30350.html].