Unfortunately, I hadn't actually look at the specs of the camera before I commented. Looks like I'll pass on this one, at least until there's a version with an actual viewfinder, or an accessory viewfinder, like on the Leica M and EP-3.
Although I would never say that an EVF is always better than an OVF, I would say there are several aspects that make it better, or at the very least, more useful in certain circumstances.
-Ability to "crop" the image in the viewfinder to check focus
-Better low light (OVF's are hard to see through in low light, and basically useless in extreme low light conditions. With an EVF, gain can be increased, albeit with additional noise, but you can actually "see" in the dark.
-Information can be overlaid on the scene (histo, etc) and in some cases can be customized to show only what you want to see through the VF.
-100% VF coverage, which most entry level DSLR's do not have (and is, at this point, what these mirrorless cameras are trying to appeal to)
-No mirror box in the camera, which gives you a camera less than half the size of a DSLR, with no noticeable difference in IQ, in relation to sensor size.
I'm not saying these are all deal breakers, or if they really appeal to everyone. But if you need a rationalization why they could be considered better, there are several reasons why. It's now looking a bit too early for me to adopt, but give it a few years, and the technology will be ready for prime time. Give me a camera that accepts the lenses I already own, has the same features of a DSLR, with an actual VF (electronic is fine), and I'll be buying one. I'm not a pro, and the OVF v. EVF debate is a no-brainer for me, if it means I don't have to lug a brick around anymore.