They updated things, improved on the world building and characterization and made the action look amazing. And I for one can't wait to see more.
Instead of making Liono young and careless, they made him a gentle and caring young cat who gives a damn not just about his own people, but also about the treatment of other species.
The brotherly relationship between Tigra and Liono is fun and they really worked to deal with the family relationship between both them and their father.
The city of Thundara looks real, as if it's an actual place and there's genuine chemistry between Liono and Cheetarah.
Anyway, there's loads more great stuff in the series, but I for one really liked it.