Square Enix announced Dragon Quest Builders 2 for PlayStation 4 and Switch at Dragon Quest Summer Festival 2017 in Tokyo today.
Unlike the first Dragon Quest Builders, the sequel will feature slopes, the ability to dive underwater, a greater limit to the amount of blocks you can stack (it has increased three-fold, both high and low), the ability to fill high places with water, create waterfalls, glide down from high places with a glider, and supports four-person multiplayer.
Source: Dragon Quest Builders 2 announced for PS4, Switch - Gematsu