Motorola has just made two sites for the developer editions of its newest phones live, and you can actually pre-order one right now. The RAZR M Developer Edition will cost you $550, which seems about right given the specifications. It will ship around September 13th, and comes in any color you like, so long as it's black.
You can also sign up for updates on the RAZR HD Developer Edition, though don't expect news on availability or pricing particularly soon - Motorola says it won't be shipping until "before the holidays." Both dev edition devices come with unlocked bootloaders right out of the box, so you can get your ROM on unhindered.