Improvements to How You Sign In to Your AWS Account

You will now see improvements to the way you sign in to your AWS account. You can sign in as your account’s root user or an AWS Identity and Access Management (IAM) user from the AWS Management Console’s homepage. You no longer have to use an account-specific URL to sign in as an IAM user. However, the account-specific URL you have used in the past to sign in will continue to work.
Quelle: aws.amazon.com