Square Enix and Avalanche Studios have confirmed that Just Cause 3’s Mech Land Assault content will be released on June 3rd for those who have the expansion pass. A general release will follow a week later on June 10th, with the price being $11.99/€11.99/£9.49 for Mech Land Assault. The latest addition adds the island of Lacrima where an old research facility and prison exist, with the latter under the control of Black Hand.
On this island players will gain access to two types of mechs, which can be flown all over Medici. As well as the mechs a new weapon in the form of the Bavarium Power Core rifle will be added, which is required to hijack mechs. The mechs will have various weapons and abilities, like being able to grab helicopter and smash them into the ground.
However there has been no announcement yet for patch 1.04, which is needed to counter some of the issues that patch 1.03 added to Just Cause 3 for some players, including worse frame rates and draw distances.
Source: Press Release