Since it's the week of the 20th and I hadn't heard anything further I gave SOA a call yesterday. It took a bit of doing for them to find it (sounds like some of the information was mis-entered somewhere along the line) but mine was scheduled for 7/14, released the same day, shipped by rail on 7/15, and shipped by truck yesterday.
If those dates mean what I think they do it was only built last week, so hopefully it left the factory with the 504 version already installed.
Either way, its arrival at the dealership should be imminent!