Enjoy the changes spread across warfare, politics, economy and more! As well as experiencing Brazil during a key era in history!
Read the Patchnotes: https://forum.paradoxplaza.com/forum/threads/victoria-3-update-1-5-and-colossus-of-the-south-region-pack-now-available.1609767/
Also note that save games from 1.4 will not be compatible with 1.5, due to map changes and mechanical changes!