A few days ago I wrote a blog post about the brand-new Azure AD Domain Services feature, but unfortunately it was not available to us in Europe. Now you can test it, take a look at the chart that displays the various Azure features and the regions here https://azure.microsoft.com/en-us/regions/#services and check my blog post here https://spanougakis.wordpress.com/2015/10/15/azure-active-directory-domain-services-your-domain-controller-as-a-service/
Happy testing!