There is no more /console RDP switch since Windows Vista.
Yes, the Remote Desktop Services mmc snapins that you were used to in 2008 have been removed.
A Windows license grants you two "administrative" simultaneous remote desktop sessions before you need to install the Remote Desktop Services role with CALs. There is no "2 administrative connections +1 console (which would make 3 simultaneous interactive sessions)" though. It's just two. You can use the /admin switch with the Remote Desktop Client to avoid using up CALs when the RDS Session Host role is installed, but you can only have two admin connections at a time regardless.
From this Microsoft article which does a great job of explaining:
At any point in time, there can be two active remote administration sessions. To start a remote administration session, you must be a member of the Administrators group on the server to which you are connecting.
To RDP to a Windows Server 2012 VM hosted on Azure, you need to ensure that you have opened the endpoint in the Azure portal (think of it like a firewall ACL) in Azure, and also make sure RDP (port 3389-in) is allowed through the Windows Firewall as well. Then you need to make sure you're logging in with a user account who has 'Remote Desktop Users' privileges or better.
Next, disable the setting Restrict Remote Desktop Services users to a single Remote Desktop Services session by using the Group Policy Object Editor MMC-snapin to edit your Local Policy.
It's under Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections.
Run gpupdate after you make changes to the policy to apply them immediately.
I have a Server 2012 VM hosted on Azure, and I just followed the above steps, and now I am logged in twice, interactively, as the same user.
This is caused by users running Remote Desktop in multi-monitor mode. If they log out, uncheck the checkbox on the Display tab which says "Use all my monitors for the remote session", as so..., and then log back in, then you will be able to Remote Control their session.
There is unfortunately no work around for this issue.
Best Answer
You can type "Query User" into a command prompt on the remote machine to get a very quick look