The release of Neo4j.rb 4.1 and Neo4j-core 4.0 brings several significant improvements, including enhanced performance, support for Neo4j 2.2, improved relationship types, and increased power in scopes. The new features include full support for Neo4j 2.2, allowing users to work directly with authentication REST endpoints, as well as significant speed improvements of over 2x on most repeat queries. Additionally, the release introduces better automatic relationship types, making it easier to manage relationships between models, and all create, update, and destroy actions are now wrapped in transactions for improved performance. The new features also include more powerful scopes, cleaner code, and new association options such as dependent and unique. Users upgrading from Neo4j 3.x can follow a relatively simple process to take advantage of the improvements.