Milvus 2.3 has been released with significant updates, including the transformative upgrade of Knowhere 2.0. Key features of Knowhere 2.0 include support for GPU indexes, Cosine similarity, ScaNN index, ARM architecture, range search, optimized filter queries, code structure and compilation enhancements, MMap support, and retrieval of original vectors. These improvements aim to elevate Milvus's performance and user experience in vector databases.