PowerShell v5.0 on windows 10 adds syntax highlighting to your code.  If you update your Windows 7/8 or Server 2008 R2/2012 R2 to .Net Framework 4.5/6 and WMF to 5.0 you will NOT get syntax highlighting.  To add this feature launch PowerShell as Administrator and run the following command:

Install-Module PSReadline

Restart PowerShell and you should now see syntax highlighting.