Sources: Agência Brasil (Brasília) and Brazil public holidays (qppstudio.net). A new draft bill (Projeto de Lei No. 4.437/04) is now in front of the National Assembly. This bill, if passed into law, would make November 20 (the anniversary of the death of Zumbi dos Palmares, also known as Dia Nacional da Consciência Negra) a new annual public holiday in Brazil.
Update (November 23) Last Thursday, Brazil's President, Luiz Inácio Lula da Silva (aka. Lula), announced that he was favourable to the making of November 20 as a nationwide public holiday in Brazil.
Update (December 2) Last night, Brazil's lower house of parliament's Comissão de Constituição e Justiça da Câmara dos Deputados approved the bill nº 4437/ 2007 and sent it to the Senate for approval.