MongoDB 3.0 introduces several key features and enhancements, including a pluggable storage architecture, improved query framework, multi-threaded tools, and support for large-scale, globally distributed replica sets. The new Ops Manager tool provides operational platform management, reducing operational overhead by up to 95% and offering features such as automated deployment, monitoring, backup, and scaling of MongoDB deployments. Additionally, MongoDB 3.0 includes security enhancements, including auditing and authentication controls, which enable regulatory compliance for projects managing user data in sensitive industries. The new Salted Challenge Response Authentication Mechanism (SCRAM) is also introduced as the default authentication mechanism.