The new update is already available in the test branch:
Open Steam Library > Right click Sumerians > Select Properties > Go to tab 'Betas' at the top > Select 'testing' in the drop-down.
Note on Saved games: Games from older versions are compatible and they will load as the sandbox play mode without tech tree.
What’s included in version 0.3:
Government buildings / Palaces
There are three levels. They have a modular construction by independent blocks so you will be able to create different shapes. Once finished, the style/decoration can be changed.
The function of government buildings is to generate science points for the new Tech tree.
Tech tree
A new play mode in which the game progress by unlocking new technologies.
The option to play with everything unlocked is still available.
The city will start with limited storage capacities and a maximum number of state workers, as well as buildings and trade routes that will have to be unlocked.
Trade routes
Each port can now only operate one trade route at a time. For example, to get Copper you will have to trade with the northern region of Mesopotamia, and to buy Tin with the area of the Zagros mountains (East of Sumer).
New Wall
The new size of the wall is now necessary for the construction of the Ziggurat and the Royal Palaces, and for houses of the highest level to spawn.
Reputation → Religious influence
The reputation system for attracting new immigrants is being simplified to function only with religious influence. A new screen show clearly how it is produced and if it’s attracting new migrants.