in the interim, what would you do in a 20 x 24 dedicatd HT with an existing 7.1 speaker setup

would you guys use a 5.1 DolbyHD track by itself and not engage the rear speakers, or would you engage a 7.1 surround mode to incorporate the rear speakers?

any guess if any upcoming big releases will include 7.1 dolbyhd or DTS Master 7.1? batman?