Who's your provider? It will vary by cable provider and market.
Some have it now (though it doesn't work very well with many displays), some should get it in late November, and others probably won't see it before January or February.
Fyi, posts relating to HDTV recorders like the SA8000HD belong in the HDTV Recorders forum. That's the place to look for the latest information on DVI support and rollout.