PDML subscriber Thibouille has contacted German photo accessories manufacturer Metz and got the response from Lutz Goeschel, Metz's technical support guy:
P-TTL flash control is in planning with Metz and will be introduced during this year. Unfortunately, an exacct date of availibility is still not fixed but I'm under the impression that it will be launched at Mai probably.
So, probably in May, Metz will become the third manufacturer (after Pentax itself and Soligor) offering P-TTL flash units for Pentax and Samsung cameras.