It was tuxrace that prefented my OTA update. After deinstalling it was no problem.
I am using the preinstalled 'Digital Nature' Theme, and realized that there are some bugs now under 1.2 (was not there before). sometimes the menue bar (e.g. when updating catalogues or in the calendar) shows some blue dots and there is some mistakes in rendering the background. The lock screen suddenly is blue behind the slider. I tried to install other themes and reinstalled it, same effect. Also realized that changing the default themes does not change the background anymore (I believe that was the cas in 1.1).