Cockroach Labs has introduced CockroachDB Serverless, a horizontally scalable relational database that can be set up instantly without worrying about hardware details or capacity planning. It automatically scales with workload and is free for small apps. The serverless version maintains compatibility with PostgreSQL and supports SQL queries. Developers can start building their next app or service for free on CockroachDB Serverless, which will be iterated upon based on community feedback.