The press release is here. (Does this include Jewel's publication in Denmark, I wonder? It's not clear.)
Jewel wouldn't have been eligible for their historical fiction prize, which is open only to novels with American settings (self- and subsidy-published books excluded). Kurt Andersen's Heyday, from Random House, won the $1000 prize for 2007. There are very few literary prizes just for historical fiction, and the Langum Prize goes far in increasing visibility for the genre; I'm appreciative of its existence.
However, I disagree with the decision to penalize Random House's other historical novelists for a corporate decision they had nothing to do with. Not only would this eliminate, as GalleyCat points out, David Liss's The Whiskey Rebels, David Ebershoff's The 19th Wife, and Jane Kamensky and Jill Lepore's Blindspot from consideration, but also Karl Iagnemma's The Expeditions (from Dial) and Hannah Tinti's The Good Thief (Delacorte) -- both of which have been receiving excellent reviews. There are other Random House novels that fit the prize criteria as well.
While I don't agree with RH's decision regarding Jewel, I don't feel that this blacklisting is a particularly laudable or appropriate form of protest.