AFAIU this "should" remark was more about separate GUI for Maemo. It is possible but require coders. Theoretically it is possible to do it fast - there is proof of concept mail client in proverbial "10 lines of code" (OK, bit more ) but polished, finished product will require much more work.

I wonder who gave money KDAB and Intevation. If it was Nokia author would mention only Maemo or Maemo and Symbian but explicitly Maemo and Windows Mobile? Interesting.