Here is a list of new features in Visual Studio 2017 for UWP developers.
Installation Improvements
- Installation size of UWP development tools is reduced to 50%.
- Installation time reduced to 67%.
XAML Editor improvements
- Remove unused namespace using the lightbulb
- Autocomplete namespace references
- Relevant selection is loaded in XAML properties in Intellisense
Debugging and Diagnosis
- Run-to-Click tool let you execute the exact line of code
- XAML UI debugging tools use Live Visual tree
- XAML edit and continue
- XAML UI Analysis tool

Nigel FernandesPosted Jan 5, 2017, 11:36 PM
This: "Installation size of UWP development tools is reduced to 50%". seems like a major winner , size on visual studio 2015 is about 8 -10 GB i think ..