The newest Micro Four Thirds camera, the OM-D E-M5, is a return to the SLR-like four-thirds and mirrorless cameras rather than the smaller PEN series. The camera sports the latest generation of Olympus image stabilization, working on three rotation axises as well as horizontal and vertical movement; a 16MP sensor, ISO settings to 25600, and weather sealing similar to the Four Thirds flagship SLR, the E-5.
The OM-D E-M5 feels like the most serious Micro Four Thirds camera yet, but it has some noticeable glitches. It is not as small as the Sony NEX cameras, but lacks a solid handgrip to instill confidence. It also lacks "focus peaking", or another at-a-glance check for focus precision, although it helpfully can zoom-in to assist.