With the new DOJ advocating completely eliminating crack/powder disparity, now what?

Because the wheels of federal sentencing reform move slowly in Congress, the Justice Department's important advocacy for completely eliminating the crack/powder sentencing disparity (basics here) probably will take a while to become new sentencing legislation.  But the realities of federal sentencing decision-making move very quickly in the courtroom.  Specifically, in fiscal year 2008 there were over 6000 crack sentences imposed in federal court, which means that over 100 crack defendants are sentences each and every week in federal court and that perhaps 20 or more crack defendants are scheduled to be sentenced just later today.

What should now happen in these upcoming crack sentencing cases later today and tomorrow and next week and next month?  What should happen in on-going sentencing appeals in which a defendant is complaining to a circuit court that his within-guideline sentence is unreasonable?  What should happen to those cases involving defendants getting the retroactive benefit of the new crack guidelines, but have seeking an even greater reduction than the US Sentencing Commission authorized?  And, whatever federal judges can and think they can/should now do, what will federal prosecutors nationwide be recommending that judges do?

Exciting times... and uncertain times.  I guess this is the inevitability consequence of change we can believe in.

UPDATE:  Both Senators Durbin and Feinstein have been asking hard questions about how to apply new rules to old cases, and nobody has really good answers (and Senator Feinstein used the term "parole" in her question, perhaps because even she does not completely realize there is no such concept in current federal criminal law).  Of course, one possible "easy" answer might be to take care of this problem through executive clemency mechanism, rather than forcing courts to deal with these matters.