Java 15 has introduced several improvements to tooling, security, cross-platform consistency, efficiency and performance. The release includes features such as Text Blocks, which are multi-line strings that can be used for embedding snippets of other languages in Java code. This feature provides improved indentation handling and escape character management compared to standard String literals. Additionally, preview features like Pattern Matching for instanceof, Sealed classes and Records have been introduced, offering fine-grained control over subclassing and data modeling respectively. These features aim to improve the overall developer experience and provide a glimpse into the future of Java as a modern language.