Ubisoft Montpellier creative director Jean-Philippe Caro has said on Twitter that the studio’s working on a prototype for a ZombiU sequel.
As pointed out on NeoGAF, ZombiU writer Antony Johnston also hinted on Twitter last month that a sequel to the Wii U launch game may be on the cards.
Earlier this year, ZombiU producer Guillaume Brunier told NintendoWorldReport that Ubisoft considered including cooperative gameplay in ZombiU but "ruled it out quickly as we thought we could not deliver it on time". Were DLC or a sequel released, however, he said exploring "how to bring a cooperative experience and still keep fear and tension is a question we would love to address".
Last year, prior to the game’s release, Ubisoft senior vice president of sales and marketing Tony Key told IGN that new technology like Microsoft's SmartGlass and the link-up between PS3 and Vita meant a port of the Wii U game was certainly a future possibility. It wouldn’t be surprising to see a potential sequel released on multiple platforms either.