TLDR ( VS 2015, .Net 4.6, TFS, ... );

.Net 4.6 -> HTTP/2 support and IIS 10 supports it ( Windows 10)

Milestone for .Net core ( will probably be released here : https://github.com/dotnet/core )

F# 4.0

Build vNext is in private beta, send a mail ( http://blogs.msdn.com/b/bharry/archive/2015/04/29/visual-stu... )

Team Project Rename ( TFS )

Docker Support in Build Deploymenet ( i suppose TFS)

Better agile project management (kanban, ...) -- screenshot: https://i3-vso.sec.s-msft.com/dynimg/IC795776.png

For VS 2015 RC itselve, it's mostly an iteration on improving the Visual Studio ( previous version of Visual Studio was CTP 5)