Explanation: ROLLBACK_IN_PROGRESS means an ongoing removal of one or more stacks after a failed stack creation or after an explicitly canceled stack creation. DELETE_IN_PROGRESS means an ongoing removal of one or more stacks. REVIEW_IN_PROGRESS means an ongoing creation of one or more stacks with an expected StackId but without any templates or resources. UPDATE_COMPLETE_CLEANUP_IN_PROGRESS means an ongoing removal of old resources for one or more stacks after a successful stack update.
Reference:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using…