Always follow the upgrade guide when upgrading to a new version. The changelog does not list breaking changes that are fixed via the update procedure.

1.0.0-beta.6 (2016-06-13)

Admin elevation no longer required on Windows (angular#905).
Automatically add SASS/Stylus if project is initialized with --style={sass|scss|styl} (angular#998).
Allow any number of env files (angular#913).

Fix adding 3rd party libs without package format (https://github.com/angular/angular-cli/pull/1028/commits/065e98f40384f8b28dcaf84028c411043697ff11).
Fix github deploy deep links (angular#1020).
Fix ng e2e exit code (angular#1025).
Fix missing vendor file (angular#972).
Fix github user pages base href (angular#965).

<PROJECT-NAME>AppComponent is now simply AppComponent, and it's selector is now app-root (angular#1042).
Route generation is temporarily disabled while we move to the recently announce router(angular#992). It is recommended that users manually move to this router in all new projects.

ng new -mobile fails npm install (angular#958).
Adding 3rd party libs without SystemJS package format breaks prod mode (angular#951).
Deep links do not work on Github pages deploys (angular#995).
ng e2e doesn't return error exit code on test failures (angular#1017).
ng build -prod fails on mobile projects due to missing vendor file (angular#847).
Github deploy to user pages doesn't use correct base href (angular#965).
ng test on windows hits the file discriptor limit (angular#977).
ng serve/build/test need admin elevation on Windows (angular#641).