The SQL Server team has a new CTP out:
We’re excited to announce the monthly release of SQL Server 2019 community technology preview (CTP) 2.5. SQL Server 2019 is the first release of SQL Server to closely integrate Apache Spark™ and the Hadoop Distributed File System (HDFS) with SQL Server in a unified data platform.
This is a big one for me: lots of changes in Big Data Clusters, PolyBase on Linux, and a Java SDK. Looks like I am going to be pretty busy.