Hidden at the end of a press release for Microsoft's impressive holiday line-up is word that there'll be news on the GTA IV DLC this autumn. That's 'news' and not a release date.
Whether that means we can expect a release around then or later in the year (dare we mention '09?) we still don't know.
Microsoft says: "In autumn there will be news from Liberty City; the first episodes of GTA IV will be available for download exclusively on Xbox Live, underlining Xbox 360's leadership role in the field of digital entertainment."