N9 prototype got fully developed and released as the E7. Nokia just changed the name.

It is no coincidence they looked very similar in the early N9 videos and they look exactly the same in the more recent 'N9' videos (before E7 release) where an unbranded 'N9' was actually running symbian as well, advertising everything the E7 could do, but because it had no name, the testing guy assumed it was the N9, which is true, Nokia just released it as an E7.

So whatever the 'N9' looks like in those videos, is actually the E7. If Nokia chooses to release an official N9, it wont look like the above image or videos because those videos of the 'N9' prototype are actually of the E7.

I'm surprised most people didn't work this out already.