In case you missed the announcements at BUILD this week, we now support .Net 4.5 on both Windows Azure Web Sites and Cloud Services. Additionally, Cloud Services has a new OS version 3 that runs Windows Server 2012. I’ll write up a more detailed post shortly, but if you were waiting for the ability to use async/await, Web Sockets, or any of the many new features in .Net 4.5 or Server 2012 in the cloud you can now do so!

See more details here: http://blogs.msdn.com/b/windowsazure/archive/2012/10/31/here-s-what-s-new-with-windows-azure.aspx