The official announcement from Microsoft - PowerShell is now open sourced. You can get it on your favorite Linux distro and even OS X. Find it at https://github.com/PowerShell/PowerShell
Xamarin Dev Days are community run, hands-on learning experiences that promise to be more than just a hackathon. They're coming to dozens of cities in the next few weeks so check out the one nearest you.
Beginning October 2016, you will be able to install a new update release called the .NET Framework Monthly Rollup. The rollup will update the .NET Framework with the latest security and quality improvements.