Hey guys I'm back with a new update on sccm 2012 R2. We now have an Hotfix which will add the ability to push notifications to clients and will also greately reduce the time taken to do a remote wipe on managed mobile devices.
Link to Hotfix : http://support2.microsoft.com/kb/2990658
This hotfix adds the client notification component to Microsoft System Center 2012 R2 Configuration Manager. This component provides fast channel communications that a Configuration Manager administrator can use to notify clients to start time-sensitive tasks as soon as possible.
The above is quated from microsoft website and from that i see that we can send notification messages to users. Wouldn't that be nice if you can send notifications to users...