I'm on that forum too and from what I gather so far it is only the studio Lionsgate that is doing that, not Netflix or RedBox or Blockbuster.
So far everything I've rented from Blockbuster that came from any studio other than Lionsgate has had DTS-HD Master Audio (if it was suppose to in the first place).
'05 X3 3.0i Alpine White/Gray Leather/Alum. Trim
Premium Sound/Staggered Style 114 18"ers