First of all, new character. Her name is Horizon and she is a scientist using antigravity technology on the battlefield. Sounds cool? You can learn more about her in a href="https://youtu.be/PfLXL0jtMUQ">her own video.
Other than that, seventh season also brings a number of other novelties. There is a new ranking, obviously, new map, new battle pass, option to create smaller in-game communities and, check this out, Apex Legends' Steam release. Everything you want to know about AL's 7th season can be found here.