DPReview has published a hands-on review on Olympus E-M5. They mention it being surprisingly small but a capable camera.
Their summary: I may only have had my hands on the E-M5 for a relatively limited period of time on a dull day in Amsterdam, but that’s still enough to leave a very positive impression. It’s the kind of camera that long-term Olympus users will recognize – small, solid, and highly capable – and its high-end spec such as weatherproofing and fast continuous shooting is the icing on the cake.
The only potential banana skins we’ve identified to consider before placing a pre-order are the tiny buttons and the way that the optional larger grip makes certain controls less-easy to reach – perhaps most notably the movie record button. But in key areas such as speed, access to essential controls, and most importantly image quality, the E-M5 appears very promising. We’ll obviously need to wait for a fully-reviewable sample to really get to grips with it, but the omens are looking good.