Yes, you can now use freestyle layouts and other fun bits.
Yes, you of course need an HTC phone for this. And one with Sense 6 and up.
This seems to work on both Sense 6 and Sense 7 phones, but some aspects of freestyle layouts require Sense 7. Not sure just what bits that doesn’t work on a Sense 6 phone. Installed it on my M7 and M8.
But, for us with Sense 7 (those with recent Marshmallow updates) you’ll get the full experience of freestyle layouts.
It’s pretty cool to have wallpaper(s) that adapt to time and so on. And, you can now easy change wallpaper for the app drawer.