Green Ronin will not be signing the Game System License (GSL) at this time.
We plan to do one product in support of 4E: the Green Ronin Character Record Folio. This will be an update of the d20 System Character Record Folio and we'll be publishing it under the Open Game License (OGL).
Let me be clear in stating that I don't think that the people in charge of WotC currently are just waiting to attack companies with frivolous lawsuits. Once you sign the GSL though, you open yourself up to that at any point in the future. Who knows when new people will take over the D&D brand and who can say what their vision will be? Who knows when the political winds at WotC will change again and things will get even more restrictive? We do not want to operate under such a cloud moving ahead so that's why we won't be signing the GSL.
Na íntegra, aqui. Em breve será traduzido para a Rede RPG.
UPDATE: Já traduzido e aqui.