‘Darkwing Duck’ Revived at Disney+ Starring Mark Hamill, Seth Rogen, Lizzy Caplan and Lilimar
Disney
(www.hollywoodreporter.com)
Apparently he was on board as recently as this March, and had even recorded a pilot, but he gave an interview in August that revealed that he was no longer attached to the project and the role would be recast. No real details though.
From what I can see it looks like the overall shape of the series has changed pretty dramatically in that time as well. It was originally going to be about an older Drake picking up the mantle again after a period of retirement, ala The Dark Knight Returns. Now it seems to be something about the character being transported to an alternate dimension where nobody's ever heard of Darkwing Duck. (Which, wasn't that a subplot in the DuckTales reboot?)