They were suppose to make the BBPlugin render to whatever rate the DAW is set to.
I think some of the original RealTracks/Drums were recorded at 16bit,
but I remember asking way back in 2010 for 24bit 48Khz so after that I'm hoping they at least started recording at a higher rate.
There is suppose to be an 24bit 48Khz Audiophile version coming.