Yes it's Object oriented, it was supposed to replace JS long time ago, but google kinda dropped the ball on that. I wish it replaced JS. Dart was almost dead for a long time but flutter kinda saved it. Developing on flutter for cross platform applications has been a joy to work with even though there are still a lot of drawbacks to flutter right now.

you can find their blog here where they talk about future releases and planned features https://medium.com/dartlang

Dart is an object oriented language with optional type inference. It's not replacing JS but it's better designed.