I found an interesting post inside the dpreview forum:
Manual focus on E-P2 works a bit different than on E-P1 – at least in case of m4/3 and 4/3 lenses.
Moving focus ring automatically brings up magnification view (it is by default, but you can change it through menus). That part is the same as with E-P1, but the difference is that when you stop with focus adjustments (when you stop moving focus ring), E-P2 automatically closes magnification view, and you can see the whole scene.
You can check video sample at:
and the result photo is available at: