check this link

http://wiki.maemo.org/What_can_we_realistically_expect

What are the officially-confirmed major feature in future Maemo 5 release ?

- PR1.2

1. QT 4.6

Source : [Confirmed by Qgil, Trolltech, etc.]

2. Live wallpaper

Source : Bug 3910

3. Customizable single menu, no more "More"

Source : Bug 5349


- PR1.3

1. QT Mobility

Source : Konttori