Grinding Gear Games recently announced the release date of the next expansion to Path of Exile, called "Incursion." This expansion gives a nod back to the very first expansion (Sacrifice of the Vaal) by sending players a thousand years into the past to the long-dead Vaal Empire.
From the press release: "The ancient Vaal treasure temple of Atzoatl has been lost to the world for thousands of years, swallowed up by the jungle. Alva Valai, a relic hunter, has learned that she can locate the ruins of the temple by thrusting you back into the past, through a series of Temporal Incursions into the temple while it was being constructed. Path of Exile: Incursion examines the effects of temporal causality by allowing you to change the future of the temple through your actions in the past. During your Temporal Incursions, you can open doors and slay Vaal Architects, modifying and upgrading rooms in the future. Be careful with the direction that you modify the temple though, as upgraded rooms confer great risks alongside their great rewards."
Path of Exile: Incursion will launch for PC on June 1, 2018, and the Xbox One version is set to release one week later.