Sunlight now interacts realistically with surfaces, creating much more immersive sunrises and sunsets.
For the retail DVD version: Version 1.40 is too new to be on a physical disk (disks usually contain 1.0 or 1.20). You must patch up using official patches from SCS's website, but SCS has largely removed 1.40 direct links. Download Euro Truck Simulator 2 Version 1.40