SQL Server 2016 RC3 was publicly released this month and there was a major change that actually came in with RC2 that not everyone seemed to have noticed. Starting with SQL Server 2016, it appears that .Net Framework 3.5 is no longer an installation requirement. For SQL Server from 2008 through 2014, the installation wizard required .NET Framework 3.5 to be installed. Many people have been asking why the older .NET Framework version is needed if a later version was installed. The official answer was that the older .Net Framework was significantly different than the newer 4 branch of the Framework, and the SQL Server engine relied on those old pieces of code to remain functional.
The good news is that rewrite has finally happened effective with this version, and along with the other changes like making the tools install a separate installation, should help make installing SQL Server 2016 should be much easier.