Smite season 3's patch notes are here. Some intereting new features have made it, including new God skins (detailed below), a new map for joust mode and even new achievements.
New God skins pictures:
Also included are two new God cards, new voice packs for several Gods, new gameplay changes looking to balance out God powers and even challenges for Japanese Gods. Three Goddess' have achievements added to then too, Amaterasu, Artemis and Ravana.