They are leaked. Just illegal to use. I know this doesn't stop most things of this nature. However with the PSP anyway, anyone caught releasing a game/application/hack with an official devkit can get themselves into serious legal complications.
And most of the things the official sdk has, have been implemented in the sdk made my the homebrew community.
The only thing we can't do is to sign eboots so they boot without custom firmware. That will probably always be the case. I am not sure whether this official devkit can even do that. As far as I know, only Sony themselves can sign eboots for direct booting from official firmware.
Sorry if that doesn't answer the question very well