Microsoft announced the general availability of SQL Server 2019 on November 4th 2019 at its Ignite conference.  There are four editions:  Enterprise, Standard, Express, and Developer.  Express and Developer editions are free and can be downloaded from microsoft.com/en-us/sql-server/sql-server-downloads.

A list of new features for SQL Server 2019 is also available.

More information is available at microsoft.com/sql-server/sql-server-2019 and the Tech Community site.