Wait. Does this mean no integration into the "multiple Speakers" pane of iTunes 10, or the remote app? Not sure what you mean by that.
The Remote app allows you to choose an iTunes Library, and also to output the playing content to multiple speakers including the TV.
Bottom right corner of iTunes 10 also has a speaker selection menu where you can play the same content simultaneously to multiple sets of speakers, including the TV.
My iTunes and my Remote app list 3 sets of speakers: Computer, TV, and the set connected to the Airport Express in the kitchen. All 3 can be chosen together and play the same song with barely a noticeable lag as I walk room to room.
I also am lamenting the absence of the multiple speakers option either from
