Bloody-Disgusting is reporting a rumor that Robert De Niro has a role in Machete, the feature-length expansion of Robert Rodriguez's Grindhouse trailer. I think that'd be awesome. One of Robert De Niro's last great roles was in Tarantino's Jackie Brown, and I think the atmosphere of a movie like Machete would be perfect for De Niro.
Then again, I don't know how he'd feel about taking on the same character Jeff Fahey once played, though. Thems be big shoes to fill.
Assuming all goes according to plan (and I think the internet is not holding its breath), Machete starts shooting in a few weeks with Ethan Maniquis taking main directorial duties (Rodriguez is co-directing in some capacity).