I'm not 100% sure on this, but since Pagan Publishing does Delta Green, and only Chaosium has the rights to publish d20 content for CoC (WotC only had rights to the rulebook), it might be a while.
In the letters column of Dungeon #95/Polyhedron #154 Nov/Dec 2002, Erik [Mona] responds: Look for Mini-Games to continue until the heat death of the universe, but that doesn't mean there won't be room for other content. We've got Call of Cthulhu and Delta Green adventures in upcoming issues, as well as more "Improved Initiative" articles that highlight d20 System innovation from the industry at large.