• New Roslyn-based codegen, compile time and run time
• Support for C# 6.0
• ASP.NET vNext style Dependency Injection for grains
• Core API for Event Sourcing
• Code adjustments towards CoreCLR compliance
• OrleansSQLUtils.dll for SQL-related functionality
• MySQL is now supported as a cluster membership store
• Most methods of Grain class are now virtual
• Orleans assemblies are not strong-named anymore
• Storage provider for SQL Server
• Support for pluggable external serializers
• Bond serializer plugin
• Support for Json.Net as a fallback serializer
• Improved support for F# and VB
• Added [KnownType] attribute for generating serializers for arbitrary types
• New telemetry API
• Upgraded to Azure Storage 5.0
• Other fixes and improvements