Yes, you're right. They didn't intend to confuse, but to deceive! And any other interpretation is just bull*****.

And it appears the photos were faked as well. Judging by the lens they appeared to have used for the girl/street photo, not even stating "The Lumia 920 pictures in this post were taken using prototype hardware and software" can redeem them. Unless they are planning to release a phone with a DSLR lens on it.

They did it right with the 808, releasing actual photos taken by the device to the public on day 1 of the announcement, and wouldn't you know it, the world was stunned/impressed.

That's how you do it.