Significant layout change to the tech trees to make them not be so wide. [hat tip: AngryJoe]
This locks silicate civs out of all terraforming but one. Synthetics are completely locked from terraforming.
Matrix Improvements (synthetic tech) removed, population increases moved to tech.
Matrix improvements are still displayed in the tech tree.
Hive technologies are now given to Time Traveler trait [hat tip: Steam forums]
They are empty. There is nothing displayed as a reward for reasearching them in the tech tree.
The branch doesn't appear for silicates and synthetics.
----------------------------- strong opinions below -------------------------------
Time traveler already was a fairly strong ability, why buff it even further and render intuitive unable to compete?
What happened to making decisions?
Why can't I decide I want to go food improvements without growth improvements anymore? Why can't I decide to skip economics for trade or entertainment? Why are carriers locked behind repairs?
At a first glance the slimmed down tech trees look outright aweful to me. And inconsistent with Brads comments about 4x being about making decisions.