I took a look at the PowerView app, and it looks to be a general improvement over the Platinum system
1. Two way communication between shades and controller
2. Scenes and rooms with multiple shade types
3. Astronomical clock option in schedules which can depend on sunrise and sunset as well as fixed times
4. Generally slicker UI. (assign colors, icons to shades, scenes, etc.)
The PowerView protocol is incompatible with the Platinum protocol but my guess is that it is not that different. I would be interested if anyone on this forum has has any direct experience with PoweView,