@Faustino

I do not know how many times this has been said but UI of maemo 5 is regarded as STABLE according to Nokia (if you want link I can search. Have seen statement couple of times in bugzilla). Any changes you are going to see are only to modules that are open source and which community is able to change. For example hildon-desktop.

.edit
And to those who are still having doubt about firmware releases. As we currently know the 1.3 is coming and also I have lately seen couple of bug comments from bugmaster that indicate that not all bug fixes arrive to 1.3 but they are fixed in internal releases. SO that makes you wonder about future