Change effective on 20 June 2012
heroku plugins:update has been added to update your CLI plugins. Plugins installed prior to this version of the CLI will need to be reinstalled before they can be updated.
You can now set
HEROKU_APP in your environment to set the default app used by the CLI. This can be useful if you have a codebase that points to more than one Heroku app.
When errors occur, more information will now be displayed that will help diagnose the issue.
See the CLI changelog for details and update by using