The HTC One M9 will come with a new version of Sense that packs plenty of customization features like themes, the ability to add/remove buttons from the navigation bar and more. It also comes with a context-based homescreen widget that recommends apps and other services to users depending on their location and the time of the day.
Even with a lighter version of TouchWiz and Google’s new Material Design in Lollipop, HTC’s Sense UI still offers the best UI experience possible among Android devices out there. The One M9 is going to be the first handset to ship with Sense 7.0, and is scheduled to be available in key markets by the end of March.
However, thanks to a couple of leaked Sense 7.0 based ROMs for the One M8 and One M7, we can now have a closer look at the new features that HTC has included in Sense 7.0.

The default Sense 7.0 homescreen and app drawer.

Quick Settings in Sense 7.0 looks exactly like Sense 6.0 on Lollipop.

It is possible to switch between Grid and Card view for Recents Apps.

All the system apps in Sense 7.0 have been visually refreshed as well.

There are also a plethora of customization options.

The new Themes app already has a number of themes. Some of them are beautiful, while others are not so beautiful.

It is also possible to customize the UI colors in the latest version of Sense.

Themes can change nearly every aspect of the UI in Sense 7.0

Themes come with their own icons, and can change the navigation bar look as well

It is also possible to rearrange and customize the navigation bar in Sense 7.0, though the options are quite limited

Battery stats in Sense 7.0 are broken down into All, Screen Off and Screen On.
You can download the Sense 7.0 based ROM for the HTC One M7 from here and for the One M8 from here.