There is a free Xbox 360 dashboard update now available from Xbox Live. This free update is available to all members of Xbox Live.
Sorry, I can’t answer any additional questions (like “when is (insert unannounced feature) coming out??!!!” or “What about (game title) when will a fix be out for that?!!???) other then what was addressed in the Xbox.com article.
Edit: If you are not getting prompted for the AU, then test your connection to live (System Blade->Netowork Setting->Test Xbox Live Connection) and you’ll get the prompt.