Actually, it could very well be a publicity gimmick by appealing to the patriotic feelings of an Indian to invest (read spend) some hard earned money on the DVDs just because it was nominated for the Oscars.
Guess we could leave all these speculation and talk about what Aamir actually said.
In a recent interview when this actor was asked as to which of his films would make a good sequel, Aamir promptly replied, "The only film that I can think of off hand which would make a good sequel is ‘Sarfarosh'.
I think that is one film that is ready for a sequel. The characters are there. It has ended on a note where ACP Rathod and his team can take on another case. Or ACP Rathod can be show as maybe a DCP as times have changed in the last five years.
Other films have ended. You can't have a sequel to ‘Rang De Basanti'. Not with us, at least as we've died. ‘Fanaa' has ended too."
So may be after ‘Ghajini' Aamir would want to play a DCP.