There tends to be a couple of map releases a year. 2012-1 2012-2 2013-1 etc etc.
Perspective mode is the 3D birdseye style view. While on the map screen, press the right button, select map positioning and if you have perspective enabled you'll see it. If it's not there do the following (and save a few quid paying the dealer to do it) Note:- you have to have the right f/w level (better than 26) to get this to work:
Press Menu
Press Set
Press and hold the menu button for about 8-10 seconds until the service menu appears
Scroll down until you see perspective and select it, then enable it
Press menu to go back to the main screen
Select Navigation and go back to the map screen. Perspective should now appear on the map positioning list as above
HTH