48 AF-1 (Version 3.0; 16.2.2011): http://www.metz.de/en/photo-electronics/firmware-download-flash-units/mecablitz-48-af-1-digital/pentax.html
50 AF-1 (Version 2.0; 16.2.2011): http://www.metz.de/en/photo-electronics/firmware-download-flash-units/mecablitz-50-af-1-digital/pentax.html
58 AF-1 (Version 3.0; 16.2.2011): http://www.metz.de/en/photo-electronics/firmware-download-flash-units/mecablitz-58-af-1-digital/pentax.html
58 AF-2 (Version 2.0; 16.2.2011): http://www.metz.de/en/photo-electronics/firmware-download-flash-units/mecablitz-58-af-2-digital/pentax.html
Improvements:-
1. Servo mode with preflash suppression possible.
2. EV correction remains after power off/on.
3. Rear function with Pentax K-r and K-5.
As I think now many DSLR Pentaxians are using the Metz (instead of the really dated Pentax 360 and 540), the Feb 16 firmware updates by Metz is really a good news! Well done, Metz!