The Talos Principle was a slow and steady adventure game released in late 2014, and it seems like there's more to come.
Despite decent reviews the initial release didn't get a whole lot of attention but it's well worth a look for puzzle fans, and news of a sequel came out of a talk at the Nordic Game conference by developer Alen Ladavac. And was summed up in this tweet.
Interestingly, developers Croteam are also the folks behind the Serious Sam series, and you couldn't find two games that are more different in tone and style.
In fact, Talos came out of the initial work on Serious Sam 4, which is also still in the works for release in the next few years. Here's a trailer for the first Talos game.