Somehow, this is Mel's fault. I just know it.
From the official site of the Douglas Management Group, Gary Oldman's management co.:
All previous postings on this site remain accurate.
There are currently no plans for Gary Oldman to appear in the upcoming Potter film. We confirm that no negotiations are taking place. We confirm once again that Mr. Oldman is actively seeking other employment.
The public comments of the Potter producers are puzzling and also misleading.
Today we take the further step of noting that it does not look likely that Mr. Oldman will once again play the role of Sirius Black. For reasons known only to the producers of the Potter film, Mr. Oldman has not been engaged. As we approach the beginning of March we are in the "window of commitments" wherein virtually any job accepted would render Mr. Oldman unavailable for this film. The producers, we presume, are well aware of how this all works. While one does not want to jump to wrong conclusions, there is a growing sense that it was never the intention for them to have Mr. Oldman return.
I need to go find myself some good Sirius fic to cheer myself up.