I dunno...the only reason the release date is still 10 days away is they need time to burndiscs. I wouldb't be surprised if any new MAC you ordered today came with Leopard pre-installed.
I bought mine last week, so it has 10.4.10 installed, plus I get Leopard for $9.95, so I have the option to upgrade or not. Me likes
i doubt you would get a mac in the next few days that had leopard installed. my guess would be that they would hold your machine before they shipped it.