MongoDB 4.2 is now Generally Available (GA) and ready for production deployments, offering several key enhancements including distributed transactions, on-demand materialized views, wildcard indexes, MongoDB Query Language improvements, retryable reads and writes, and client-side field level encryption. The new version has already seen significant adoption with over 100,000 instances spun up, and can be deployed on-premises or through cloud services like MongoDB Atlas, which offers $200 of free credits until the end of 2019. Key features include support for a broader range of use cases, improved query expressiveness, and enhanced security measures.