First, this piece of info is probably from unreliable source, e.g. Pentax "rep", customer support, or "someone I talked to on the phone"... etc. We all know these people do not have knowledge of technical details or problems the engineers were facing. Unless it was officially stated in press release or official web page, I would not take it as the truth. For all you know, it could well have started by some users in this forum.The new firmware is very welcome - but let's not forget that Pentax
lied through their corporate teeth about WF for the K10, telling us
that 'interference problems with the AS mechanism' meant they
regretfully had to omit the feature from the new camera.
Second, if there were interference problem, why would you say it was a lie? They have now found a fix and an upgrade firmware was published. Why would you find this hard to believe?