JackM: EVF on an SLR is just wrong.
Why, oh why? The camera creates the image electronically, so why the heck wouldn't you want to see it the same way???The OVF was created and had its place in the analogue era - it is now redundant!
This is not surprising and a perfectly logical thing for Olympus to do. Think about it - Olympus don't have a M43 camera directly competing with Panasonic's GH-2 etc. This is most likely to be the OM based camera - so almost certainly would be Micro four thirds. Where is the idea that there would be a sensor size change coming from?