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From the Raptus Festival in Norway, Yoann interviewed by Empirix. He reveals that the next album is expected in March 2016, unless he gets delayed. Also cool to hear his pronunciations of the French names.
Edit: This might also be a good opportunity to mention that according to one source (who heard it from Yoann at a signing), the next adventure will be 54 pages long, up from the standard 46 that recent albums in the main series have been allowed. This should be good news, since in the opinion of many fans, several of the albums have suffered from trying to squeeze too much into too few pages. For example, Morvan & Munuera lobbied hard for a couple of extra pages in Paris-sous-Seine (Spirou & Fantasio #47, “Paris-Under-Seine”), but Dupuis remained inflexible.
(Thanks to Walter Wehus for the tip.)