While a Wallace & Gromit game — or perhaps a design based on multiple Aardman Animations titles — might seem like an April Fools' Day joke, Gordon Lamont has assured me that it's not, stating that he and Fraser were at the Aardman Animations studio in Bristol to play the game on the afternoon of March 31, after which they were given the okay to announce the license. Adds Gordon, "Nearest Fragor ever got to an April Fool was to post a picture of a white box with white cards and call it 'Snow Tails: Blizzard Edition'!"
Further evidence comes from the September 2016 announcement by the Lamonts that they wouldn't have a game for release at SPIEL 2016. To quote part of that announcement:
In the near future, we will make a major announcement regarding a license. We are absolutely thrilled to be involved with it.