[MENTION=133607]raja[/MENTION]: The glasses thing is very much possible (and awesome to think of), look at the sony QX100 its nothing more than a lens and sensor, everything else is taken care of by your phone. This is an awesome idea considering that we always have our phones and that such a design will reduce the cost and bulk of the camera
[MENTION=128954]sujoy[/MENTION]: I've been using the very small NEX6 for quite some time now, and have seen people use it with huge legacy lenses 600mm types with teleconvertors. Of course it's a very unbalanced option, but then these people tend to hold the mount on the lens and operate the focus from there, the second hand rests on the camera to operate that. So it's a drastic change, but is quite doable
The only problem with the EVF right now is that it tends to lag when used in low light (specially with magnification switched on) and it's a little noisy (still better than peering into a very dark OVF). But it allows you to see your settings, gives awesome stuff like focus peaking and magnified views and you have all your display on the EVF.