I just picked up an Olympus E-PM1 in preparation to switching to m4/3 for most of my shooting (once the E-M5 arrives in April), and was surprised that the .ORF files it produces can't be displayed in PM 4.6.8. Apple has supported the camera since last's November's RAW compatibility update - I thought PM could use this to render RAW files, but it doesn't seem to be working in this case (or I've misunderstood the "Render w/ImageIO" setting).