Or maybe this IS the device that sprouted the N900 rumors (and thus fits all of the mock-ups and rumor info we've seen in the last few months) ... but is not a Maemo phone (ie. not actually an N900).

Or maybe some of the changes they've made for the new version of Maemo include screen rotation, and thus portrait mode is now supported. For a phone (Maemo or otherwise), I would expect a lot more portrait mode support.