SharePoint Online 2013 (Previw) - Public Website

Guys,

I have created a Public Site under my SPO 2013 (preview) and set it up to be accessible anonymously. But when I hit the url (which is:http://sepisp2013-public.sharepoint.com) it stills prompt me to log in via Microsoft Portal login page. Any idea? Any lack of configuration?

For more info, the steps I followed to create and configure my public site is basically as below:

1. Log in to my O365 tenant account
2. Navigation to PS Central Admin area
3. On Site Collections list, using ribbon expand the button 'New' and choose 'Public Website' to create
4. When the new Site Collection (http://sepisp2013-public.sharepoint.com) is provisioned edit it's settings and set the 'Allow both external users who accept sharing invitations and anonymous guest links'

Any idea?

Thanks,

Sepi