Angular 2.0 development was started to address the following concerns:
Mobile
The new Angular version will be focused on the development of mobile apps. The rationale is that it’s easier to handle the desktop aspect of things, once the challenges related to mobile (performance, load time, etc.) have been addressed.
Modular
Various modules will be removed from Angular’s core, resulting in better performance. These will find their way into Angular’s ever-growing ecosystem of modules, meaning you’ll be able to pick and choose the parts you need.
Modern
Angular 2.0 will target ES6 and “evergreen” modern browsers (those automatically updated to the latest version). Building for these browsers means that various hacks and workarounds that make Angular harder to develop can be eliminated allowing developers to focus on the code related to their business domain.
