Today Nokia rolled out a small update (only 8Kb!) for Symbian Belle devices which is called “Quality improvement”. It is meant to fix stability issues for Qt apps. Nokia gave following small description of the update –
This update improves stability of applications developed with Qt
Thus it’s mainly a bug-fix update rolled out time to time by Nokia. I have got it OTA (Over The Air) for my N8 today (screenshots below), other S^3 phones (Nokia 500, C7, C6-01, E7 etc) should also get it. Check for update via “Menu/SW update” or via connecting your phone with Nokia Suite.