The LEGO Group confirms recent speculation they are planning a Minecraft-style game with the announcement of LEGO Worlds, which is already available on Steam as an Early Access release. This trailer offers a look, and here's a description:

In LEGO Worlds, players have the freedom to alter procedurally generated worlds and create anything they can imagine one brick at a time, or use prefabricated structures to customize their environments. Large-scale landscaping tools are available to modify terrain quickly and easily. Entire worlds and creations are brought to life with characters and creatures that interact with each other as well as the player in unexpected ways. From helicopters to dragons, motorbikes to bears, there are always interesting ways for players to explore the vast worlds and discover hidden treasures. Fans of the LEGO building sets will be rewarded with a select number of commercially available sets that can be unlocked in-game during Early Access, with many more to come in future game updates. Future plans will also offer multiplayer and sharing features, for friends to experience each other’s worlds and show-off their creations.