Wednesday, September 24th. According to developer 3D Realms, that's the Xbox Live Arcade release date for Duke Nukem 3D. Duke 3D with saved films and a rewind feature! Huzzah! Just keep in mind that this isn't an official Microsoft release date announcement, so there's a 3% chance this release date could be wrong. And as far as pricing goes, that's still undecided, but 3D Realms promises to announce it in "a very short time."
[Thanks, to everyone who sent this in]