Have a look, he has some insights of his own and the 1/250th X-sync rumour is denied (as disclaimed by Pentax Germany). There is also a DNG file for a test chart shot indoor at the exhibition hall for downloading..
http://www.falklumo.com/en/k5preview.html
Any shutter blur issue found in the K-7 (as looked with a "Falcon Eye"!) with the K-5 then? Let's see what Falk found and talks about himself!