It's been a while since Azure Classic portal is transformed into New Azure portal.
Azure Preview Portal (http://preview.portal.azure.com) is introduced on Jan 2017. It is still accessible by everyone.
I'm wondering if there is any special difference between Normal Azure Portal (http://portal.azure.com ) and Preview Azure Portal (http://preview.portal.azure.com) ?
I think most of the public preview azure services have been released in the normal Azure Portal itself. So is there is any need to go for preview.portal.Azure.com?