I don't believe it will as the ex3 has a button on the back of the monitor along with a peaking dial, and brightness and contrast dials. This new view finder is a huge improvement. I could be wrong and I won't be sending my 3- ex3 and my other ex1 in until October as they are currently working.
on the EX-1 the LCD monitor flips the scan (upside-down) when you flip the LCD around to face the front of the camera, so it seems possible. I've been updated, but haven't looked for the menu control to do that - and it's at the office. I'll check it Monday.
Keystone Media Productions