Originally posted by THoog Looking at the feature list for all the other flashes on YN's website, if the YN585 had a radio receiver, it would say so, near the top. Looks like it is optical P-TTL only. Maybe there will be a "for Pentax" version of the YN685 eventually...
To be honest, this flash is only listed at 'www.khyongnuo.com', in an announcement that's in very bad English, full of errors etc. The professional page ('www.yongnuo.eu') doesn't make any mention of it yet, so there's a chance that when the full description comes out, it may mention wireless radio control.
The announcement doesn't mention HSS either, but
insomniac claims that he talked to the Yongnuo people and they confirmed HSS.