News of the downloadable content has arisen...sort of:

Microsoft has given a glimmer of hope to GTA fans looking for their next hit by confirming that the much-lauded downloadable content for Rockstar’s opus will appear before the end of the year. In a statement issued at the Leipzig Games Convention, Microsoft said, "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."

Check out the rest over at IGN. Thanks to Taylor Stewart for the news.