Era 3 began in March, 2017. All changes between Era 2 and Era 3 may be seen on Ministry.
The most notable changes implemented in Era 3 were the introduction of jumpbeacons, several major bugfixes, and forum-suggested changes to unit stats. A further update in April 2017, “Era 3.9”, implemented additional unit changes and changed some Mesophon trader prices. Specific Era 3.9 changes are listed on the forums.
Era 3 changes were applied to all active Transcendence games, not just “Fallen Worlds Era 3”.