The Developer Edition will be different from the standard issue Galaxy S3 from Verizon, as it will not be made available on-contract with subsidies, so you will need to go through Samsung and fork out the full price of $600 a pop. Definitely a huge amount of money in these economically challenging times, but it will help sift out those who are genuinely interested in custom ROMs compared to folks who want a handset that runs as it is right out of the box without having to make any tweaks or modifications to the operating system.
Samsung has also warned potential owners of the Developer Edition that should you brick the handset with non-Samsung software, you can forget about any warranty coverage.