Those of you who have either one of the Lumia 920, Lumia 820, or Lumia 620 Windows Phones should be happy to find out that Nokia has prepared a software update, according to a Support forum post. The Lumia 920 and 820 will get version number 1232.5957.1308.00xx which should bring improved automatic display brightness adjustment, fix for intermittent screen blanking during a call, as well as additional performance and stability improvements.
The Lumia 620 should be getting version 1030.6407.1308.00xx with improved touch screen functions, including corrections in multi-touch actions, better voice quality with Bluetooth headsets that support echo/noise suppression, enhanced camera performance with corrected exposure when flash is used in bright light conditions, as well as various improvements to system stability, performance, and usability.
The refreshes should be rolled out in phases and should reach your device in the next couple of weeks; make sure to be on the lookout for the update notification on your phone.
Source: Nokia Discussions