Check out this thread. As most, if not all, already know the Atrix was rooted running 2.3.4 (nothing new there) but....apparently P3Droid feels he is close to getting root on the D3 without an SBF or OTA.
In addition apparently the method used to root the Atrix should be very close to what is used to root the D3....and whatever roots the D3 will most likely be almost identical to the Bionic.
Thread found here.
Atrix Running Stock Android 2.3.4 has been Rooted, DROID3 Up Next? - Droid Life: A Droid Community Blog