Tarrin’s short episodes of The Heroic Youth of Fantasio were well-received when the spin-off series ran in 2011 and 2012 (1, 2, 3), and the latest word was that he would continue it as an album-length adventure. However, as time passed with no further updates, fans have been getting increasingly worried that the project might have ground to a halt.
Those fears have now been proven correct, as an admin on the the official Spirou forum today confirmed the cancellation of the album:
Malheureusement, comme cela arrive parfois, la bande dessinée “La Jeunesse héroïque de Fantasio” ne verra jamais le jour.
Which is to say:
“Unfortunately, as sometimes happens, the comic The Heroic Youth of Fantasio will never see the light of day.”