New rumors over at Photo Rumors point to an upcoming Olympus PEN Micro Four Thirds model that will follow closely to the design of the old PEN F film camera. Additional rumors suggest a built-in viewfinder, which would be a welcomed feature on the mirrorless model.
No other details on specs are being tossed around at this time; however, such a camera would presumably reside at the top of the PEN line-up while the E-PM and E-PL series rounded out the low- and mid-range PEN options. It’s been a couple of years since we’ve seen a new top-level camera in the PEN series (the E-P3 in 2011, which is now discontinued).
Reasonable expectations for a release time frame would be Summer 2013.