Source: Olympus.On the rear of the PEN E-PL2 you will find a new control system, which now includes a rotational thumb-control, rather than buttons, for changing settings such as the aperture and shutter speed, and you will also notice a slightly larger screen compared to the E-PL1 ??? 3in on the E-PL2 versus 2.7in on the E-PL1.