Supabase Studio 2.0 has been released with a variety of new features and improvements. The update includes Supabase AI, which integrates ChatGPT into the studio for assisted database development. Other notable additions include GraphiQL for querying databases with GraphQL, cascade deletes, Query Performance tool, foreign key selector, Postgres Roles management, Database Webhooks, and API Autodocs. The update also includes improvements to JSON editing, nullable columns, and support for many tables in the Table Editor.