Apollo Client version 0.5 has been released with several new features and bug fixes, making it officially fully featured, stable, and ready for production use. The client now supports GraphQL subscriptions, fully static queries, result reducers, optimistic responses, network status, and fragments. Breaking changes include transport batching and the removal of query merging. Stability, usability, and performance improvements have also been made, including a standard library for store reads and writes, tighter integration with React and Angular, and bug fixes. The next release will focus on client-side resolve functions and error handling, which are being actively developed by the community.