Update: you may have to run the firmware update twice in order to get rid of all "bright spots". Here are three examples: before the update, after the first update and after the second update (.mov files may take a while to load).
"Bright spots were sometimes noticeable with live view mode or movie recording of especially dark scenes or subjects. Occurrence of this issue has been reduced."
The description says that the "bright spots" issue has been "reduced".
If you had that problem before, I would like to hear you feedback on the new firmware.