When you first install Civil 3D 2015 you'll immediately notice that there is no coordinate information being displayed in the status bar. My first thought was, "Great, they finally removed that useless X, Y, and Z information lingering in the status bar" (in all sarcasm of course). You may have also noticed that your drawing may have a coordinate system assigned to it but that too is no longer displayed in the status bar.
No need to fear. It's all still there. We've just got to turn it on.
To turn on the coordinate information:
And to display the coordinate zone information: