Microsoft Connect(); is a developer event from Nov 15-17, where plenty of announcements are made.  Here is a summary of the data platform related announcements:

• Azure Databricks: In preview, this is a fast, easy, and collaborative Apache Spark based analytics platform optimized for Azure. It delivers one-click set up, streamlined workflows, and an interactive workspace all integrated with Azure SQL Data Warehouse, Azure Storage, Azure Cosmos DB, Azure Active Directory, and Power BI.  More info
• Azure Cosmos DB with Apache Cassandra API: In preview, this enables Cassandra developers to simply use the Cassandra API in Azure Cosmos DB and enjoy the benefits of Azure Cosmos DB with the familiarity of the Cassandra SDKs and tools, with no code changes to their application.  More info.  See all Cosmos DB announcements
• Microsoft joins the MariaDB Foundation: Microsoft is a platinum sponsor – MariaDB is a community of the MySQL relational database management system and Microsoft will be actively contributing to MariaDB and the MariaDB community.  More info
• Azure Database for MariaDB: An upcoming preview will bring fully managed service capabilities to MariaDB, further demonstrating Microsoft’s commitment to meeting customers and developers where they are by offering their favorite technologies on Azure.  More info
• Azure SQL Database with Machine Learning Services: In preview this provides support for machine learning models inside Azure SQL Database. This makes it seamless for data scientists and developers to create and train models in Azure Machine Learning and deploy models directly to Azure SQL Database to create predictions at blazing fast speeds
• Visual Studio Code Tools for AI: In preview, create, train, manage, and deploy AI models with all the productivity of Visual Studio and the power of Azure.  Works on Windows and MacOS.  More info