Long Live the Confederation!
Places will be more than happy to take your pre-order money though, even if the date keeps getting shoved back and back.
I wouldn't worry too much about this -- no legitimate retailer (ie, Amazon, DD, etc.) will charge you for a DVD until your order is ready to ship.
The only thing different this time is I believe that the Weinsteins have an exclusivity deal with Blockbuster for releasing theire films (it applies only to rentals and not sales fortunately).... an idiotic notion if you ask me that shuts out a huge market of potential renters who live places not anywhere near a blockbuster.
It will mean lots and lots and lots of cheap almost-certainly-unwatched copies for purchase about six weeks from whenever the release is, though!