With this release, we're moving forward in our development cycle to the release candidate phase. While in release candidate, we're doing aggressive testing and bug fixing on any issues that pop up. If all goes well over the next few weeks, we'll call it a 1.0 in preparation for DrupalCon London. We may or may not have additional release candidates depending on whether or not any serious bugs get reported or database updates are required.
If you are updating from a previous release, you should first test the new release in a development environment. Do not attempt to update initially on your live site in case something goes wrong!
You should start the process by updating all of your Drupal Commerce dependencies to the latest tagged releases. This includes Address Field 1.0-beta1, Ctools 1.0-beta1, Views 3.0-rc1, Entity API 1.0-beta10, and Rules 2.0-beta2. Then update to the latest version of Drupal Commerce and run your site's update.php.
If you're updating from a version prior to 1.0-beta4, you should also review the notes associated with that release. There were reported API and Rules integration changes that you must take into account.
Additionally, since beta4, three changes will require manual intervention: