What's new in 2017 version is you can apply wall opening while you have the wall selected. It works in both Curtain Wall as well as Basic Wall.
Wall Opening icon is in fact available in Revit 2017. The very same icon was always there but it used to be grayed out in the previous versions.
With this easy access to the tool, you can insert an opening to curtain wall more efficiently. I am not a big fan of using this tool but it is quite handy if you need to apply opening to Curtain Wall.
Hope you will find it useful. 😉