I updated the study I posted earlier.
The main addition is a comparison with a *istDS. Using this comparison, there is no significant difference between how the K20D and the *istDS produce hot pixels during long exposures w/o dark frame subtraction.
Originally posted by gkopeliadis Ok, this person currently carries out tests with the only camera (his K20D) having the new firmware applied as a patch already, at German forum DFN.
Preliminary results indicate that the hot pixels are gone, indeed and that no additional 2s dark frame subtraction is carried out. The same for 3s remote shutter release delay.