Yeah, Pro Logic/Pro Logic II is not being implemented in these brand new models; so I would need to find a way to make these so-called "upmixer" systems work.
Right -- but that is a problem when, say, a DVD contains a "2.0 Stereo" soundtrack that has surround information that needs to be MATRIXED from it. In the past, such DVD soundtracks could be dealt with by using Dolby Pro Logic II, where the dialogue would go into the center speaker and the surround channels would get the proper "ambience" information.
If there is no upmixing approach taking place, a stereo soundtrack from a FILM on DVD -- NOT music -- wouldn't play back correctly because everything would come from the left and right front channels, INCLUDING dialogue. This creates a strange "comb filtering" effect that sounds VERY weird (believe me; I deal with that now when I watch Blu-rays with 2.0 mono soundtracks and because my receiver can't properly process DTS-HD Master Audio signals that are in two channels, the whole mix gets sent to the left/right mains).
Now, when it comes to standard 5.1 and higher surround signals, whether it's Dolby Digital, DTS, Dolby TrueHD or DTS-HD Master Audio, yes, I would need an AVR to simply process these and send them out as-is. The problem comes into play when I watch a disc that contains either a one-channel or two-channel soundtrack...and how the receiver steers these.
Come to think of it, it's also a problem when I watch older DVDs --- or even new rentals -- that contain trailers or promos before the feature which are encoded in two-channel....with my current AVR, Pro Logic II kicks in and these trailers/promos play correctly, but if the new AVRs don't do this automatically with two-channel signals, I am going to be forced to listen to the audio from the left/right mains.