This one's still trickling in, but it appears that the keys needed to bypass the bootloader protection used by Motorola have been uncovered, with proof posted on Twitter. This means developers should be able to build true custom .sbf files and sign them so that they can be flashed via the locked and encrypted bootloader on select Motorola devices. And presumably, Motorola has its cease-and-desist macro at the ready. Holy shades of Sony v. Geohot, Batman, this is going to get interesting!
To you and I, these aren't of much use. I'm sure the people that needed them are already hard at work, and soon we will see the benefits. In the meantime, hit the source links to keep track of the progress. [@nenolod; nenolod.net]
Update: Turns out this was all a hoax. Nothing to see here folks. Look here for details.