I note in the v 5.0 it mentions
Better Tech
All-new SVG w/JS, modernized CSS, and official JavaScript component packages.
I have identified a way of using font awesome icons in place of the TW5 SVG for buttons etc... below
But I wonder what font awesome is offering on the SVG front?
We can use of the following in place of an image transclusion in buttons
<i class="fa fa-ban"></i>
Or the classier
<i class="fa fa-ban" style="font-size:16px;color:red"></i>
Which can also be transcluded allowing us to name our own icons
Eg icon-delete tiddler containing <i class="fa fa-ban"></i>
{{icon-delete}}