I would be interested to know how much Qt stuff Symbian and Maemo will share. Symbian is expected to get a Nokia contributed UI overhaul in version ^4. That would include the vague "Direct UI" (better come up with a marketing name before it becomes DUI) and the "Orbit" Qt widget set designed for mobile UI:s, Qt Mobility APIs etc. The whole software suite will be rewritten to take advantage of those(see a pattern here?). I expect the new UI to be at least on the designers' table already.

I guess it would be safe to assume a lot of that will find it's way to Maemo too. Can any of you Nokia folks comment on this? It would be interesting to know if / how much the Harmattan UI or app suite will differ from its Symbian counterparts? Will we get a glimpse of it before it is released? Will there be any community input regarding the new UI?

Don't know if the "leaked Harmattan screenshot" was just a mockup, but I expect the coming UI to be very different from what it's now. I'm very excited about this even if it's still far away.