Um, no. I'm not saying Harmattan won't come for N900, but this has nothing to do with it.

The demo is about Uiemo, aka Orbit, aka the Symbian Qt framework, not about Maemo6. What can be inferred from this video is that future Symbian Qt apps might work quite easily on Maemo, which is of course a very good thing.

Then again, I might mention that the Maemo 6 UI framework has been released on gitorius even before, so I doubt that's going to be the problem. What might be the problem with Harmattan apps on N900 is how Nokia wants to handle DRM...

Well, my 2c anyway. I might have confused some things over the way, the whole Harmattan/Qt -thing is anything but clear right now.