The new channels will be added in September.
By Phillip Swann
Washington, D.C. (June 12, 2007) -- DIRECTV plans to carry 11 HBO/Cinemax channels in High-Definition this September, TVPredictions.com has learned.
See the rest of the article at TVPredictions
Other articles there discuss that HBO will have all 26 of their networks in HD... just not confirmed for DirecTV.