Leaked unsecured bootloader for Verizon's Samsung Galaxy S III may mean developer model won't sell
There are tons of caveats which makes this something that only those with experience should try. For example, should Samsung ever update the bootloaders on the device, using the tool could result in your phone becoming a building material (brick). If you go ahead and install this, you cannot accept any update without first flashing the Odin Packages found at the sourcelink.
Perhaps the best thing to do is wait to see what some of the more advanced developers do with this.
source: XDADevelopers via AndroidCentral