I have been wondering the same thing since the announcement of 2.0 on the new set. Last night, I put in the 2004 SE OT DVD's and put on the 2.0 Dolby Surround and it did come up Dolby Prologic on my decoder/surround sound system, and ALL 6 channels were playing.

I compared it to the 5.1 DD for each movie, and yes, 5.1 was better and a little more deep, but it wasn't THAT much better that it pissed me off. If the O-OT in September has roughly the same sound in 2.0 as the 2004 SE OT did in 2.0, I will be satisfied.