If you own (or will own soon) the new E-M5II than do not forget that there is a Olympus High Res Shot Raw File Photoshop Plug-in. You can download it here: support.olympus-imaging.com/hp1download/product/index.
In the meantime there is a new E-M5II review at Photographyblog:
In many ways the E-M5v Mark II out-performs the OM-D E-M1, most notably with it’s much more versatile tilting screen, better video options, improved image stabilisation, and the innovative and highly effective High resolution mode. Our main criticism of the Olympus OM-D E-M5 Mark II lies not with its performance, design or feature-set, but with its price.