I thought the images of the supposed N920 had already been debunked. Well, if you guys didn't know, the writer at Nokiaport.de made the image in Photoshop just as an idea, and the world ran with it as a possible leak without checking with the source that was clearly watermarked on the image. Here's the entire story about that image to end all of the conjecture:
http://www.nokiaport.de/forum/thread.php?threadid=5379

Also, "plans to ship another device" aren't the same as other devices in development or existence. There DEFINITELY IS another device, currently going by the name N920, and its a variant of the N900, minus the keypad. I know of one person that is very honest and reliable that claims to have actually seen and used the N920, so I'm pretty confident in his claim.