Neo4j 2.0 has been released with significant changes, including a purpose-built graph query language, the Neo4j Browser as a fluid developer workbench, and enhancements to its Cypher query language, which now supports node labels, uniqueness constraints, automatic indexes, new clauses such as OPTIONAL MATCH and MERGE, and literal node patterns, allowing for more efficient querying and data management. The browser provides a clean UI with helpful guides, reference topics, and visualizations, making it easier to get started with graph databases.