There's not a lot to say just yet, other than a method was found but it will not be released until after Jan. 12 -- when Ice Cream Sandwich (tentatively) begins to roll out for the Prime. Agree or disagree with this practice as you will, but there's not much to be done about it, other than plug it in to your computer and work it out yourself. Let's hope that the method works with the ICS update, and my advice is not to take any updates until we know for sure if you plan on rooting your Prime. When more is known, we'll be sure to tell you.
Update: They decided to release the method after all, according to the @andirc Twitter account:
@androidcentral I released it, after deciding we would likely be safe with ICS.