We have been discussed that the arrival of Qt 4.6 final & official means better compatibility and longer life for Maemo 5.

In this context it's worth mentioning that the Qt team has started packaging Qt 4.7 (with QtDeclarative inside) for Maemo 5. Currently in Experimental and onyl for very brave developers, but this is how Qt 4.6 for Maemo 5 was 6 months ago.

http://labs.trolltech.com/blogs/2010...-for-the-n900/

Don't overlook this QtDeclarative since it has all the number for bringing plenty of apps for MeeGo and Symbian that might very well run on top of Maemo 5 with Qt 4.7 one with little or no extra developer effort.