The following series of official training courseware for SQL Server 2014 has been released.
The required MCT (Microsoft Certified Instructor) can download these courseware by logging in to the official HTTPS://MOCL.ONE.MICROSOFT.COM/CWDL ID.
10977b:updating Your SQL Server Skills to Microsoft SQL Server 2014
20461c:querying Microsoft SQL Server
20462c:administering Microsoft SQL Server Databases
20463c:implementing a Data Warehouse with Microsoft SQL Server
20464c:developing Microsoft SQL Server Databases
20465c:designing a Data solution with Microsoft SQL Server 2014
20466c:implementing Data Models and Reports with Microsoft SQL Server
20467c:designing Self-Service business Intelligence and Big Data Solutions
40074a:microsoft SQL Server for Oracle DBAs
This article from "We chased the MSSQL" blog, declined reprint!
SQL Server 2014 Official Training Courseware