Visual Studio 2015 Update 1 CTP has been released. The update includes edit and continue support for /BigObj in C++. This means you can now Edit and Continue while debugging Windows Store C++ projects. The CTP has introduced new C# interactive window in Visual Studio and the command-line C# REPL tool.
Microsoft has provided scripting APIs for C# and Visual Basic on GitHub which enable developers to load and run C# and Visual Basic code as scripts in both the interactive window and REPL tool. As a developer, you will be able to create Pull requests in the Team Explorer window via the special hub provided for the purpose.
Visual Studio 2015 Update 1 CTP also added a branch policy that requires associated work items for any pull request. You can submit code to the branch via pull request. The relevant commits will be inspected for work item links when a pull request is created.
Microsoft has officially published a detailed description of the improvements, bug fixes and common issues.