In a surprise update, Brickset has listed the LEGO Ninjago Movie City Docks (70657) in their database.
It has a price tag of USD$299.90 which suggests that it is going to be a large set akin to the LEGO Ninjago Movie Ninjago City (70620) that was released earlier this year.
This could very well be the next D2C modular set for the LEGO Ninjago Movie and hopefully feature the dockyards and fish market from the film. No further details are available at the moment but I’ll definitely keep an eye out for this as I really loved the LEGO Ninjago City set!
(Thanks Brickfanatics for the heads up!)