Java 16 would be part of the JDK (Java Development Kit) 16, and it would include various enhancements and new features compared to previous versions. Some features and improvements that were expected in Java 16 or subsequent releases might include:

1. Project Valhalla: Continuing work on Project Valhalla to introduce value types to Java, which would improve performance and memory efficiency.

2. Pattern Matching: Further enhancements to pattern matching, which was introduced as a preview feature in Java 16, allowing for more concise and readable code.

3. Foreign Function and Memory API (Incubator): The Foreign Function and Memory API, if continued, would provide a way to interact with native code and memory more safely and efficiently.

4. Records: Records are a feature introduced in Java 16 that simplifies the creation of classes used primarily for data storage, making it more concise and readable.

5. Deprecations and Removals: Java continues to evolve, which sometimes leads to deprecations or removals of older features that are no longer considered best practice or necessary.