Microsoft have just announced the end for the Azure classic portal – https://manage.windowsazure.com
This doesn’t mean that you have to have a panic attack and migrate all your classic resources to arm (at least not yet).
You can still access all classic resources through the new portal – https://portal.azure.com
Although I would recommend to anyone with classic resources that he/she migrate them over to the newer arm based deployment.
The new portal has already been in production for over two years now and in preview before that, so Microsoft announcing the end of the classic portal is no surprise. All previous services such as Azure AD that were only available in the classic portal are now GA in the new portal, and as previously stated any classic resources can still be accessed via the new portal.
So goodbye classic portal and thank you for your service