A reader just sent us that size comparison between the upcoming new mini PEN (E-PM1) and the Olympus E-PL1. The new E-PM1 is just a bit less thick and a bit less wide than the E-PL1. The real difference is made by the absence of the grip.
By the way, there are eleven of refurbished E-PL1 on Olympusmarket. Click on the numbers to see the E-PL1 auction (ordered form first to last ending auction): one, two, three, four, five, six, seven, eight, nine, ten, eleven.