$649.99 is what you had to pay to own a Developer Edition Motorola Moto X. However, if you are preparing to grab one just now, the new price is more attractive. It will set you back $549.99 for both the GSM (works with AT&T and T-Mobile), as well as the Verizon flavor of the Developer Edition phone.
These phones are the 32GB internal storage flavors and you will be able to easily unlock their boot loaders. As far as the color is concerned, the special black and woven white Developer Edition design will set it apart just a bit.