I've just posted on it over on my lj. The defence RDR Books have come out with amounts to "No more fandom": they're claiming that in knowing about, not suing and making nice remarks about the HP Lexicon over the last 5 years JKR and Warner Brothers have waived all their rights to enforce their copyright and trade marks with regards to a for profit version published now. I expect they'll lose, but make no mistake; the argument they're running is essentially "She should have sued all of you at the beginning."