Update 2: Apparently, there were Moto reps spewing false information at the Sprint event today, because both Android Central and Droid-Life have received word that the Photon 4G will not ship with an unlocked bootloader. The statement that Motorola released was still rather cryptic, however:
Motorola has recognized the passion around this topic in our communities. As we’ve previously communicated, it is our intention to include the unlockable/relockable bootloader in software releases starting in late 2011, where operator and channel partners will allow it. However, this feature is not included in the software found on PHOTON 4G.