the frf84b, is motorola's 84th build of the froyo source. the source files that we are building from are updated daily by google and many other sources. if they built that 2 days ago the release we made last night is more up-to-date than that release.
with the exception of the drivers that allow the android OS to communicate with the hardware of the Motorola Droid.
we will be making another release tonight to update our drivers to the most recent leak.
outside of the drivers, all from-source roms will be more up-to-date than any leak can ever be.