Got this from Ruger today:
Thank you for using the Ruger On-Line Customer Support Request Form.
This e-mail is in response to your question or comment of 07/31/2009
Request No: 37378
Comment / question:
My dealer has a P512HMKIII on order for me throught Davidson's. He told me they (Davidsons) are waiting on 155 of these pistols. Can you give me any idea when I might expect Ruger to ship these to Davidsons so my dealer can get one from them?
We will be shipping this model pistol to all of our distributors this month. We do ship on a regular basis. Depending on the orders Davidson's has and the order at which they fill them, will determine if your dealer receives one of the MKIII pistols.