Want an early look at Windows 10? Join Microsoft's Windows Insider Program and you can get access to the Windows 10 Technical Preview.
Mary Branscome tackles what exactly is the .NET Core you should care about it - namely "the cross-platform opportunity".
Microsoft's new package manager (actually it is a package manager aggregator) is in the Windows 10 preview
Have a feature that you wish existed in Visual Studio? Did you know that the Visual Studio Team maintains an active UserVoice site to track feature requests?