After reading Bill Hunt's review over at the Bits, I ordered the Blu-ray, anyways (I wasn't going to because of all of the BD25 "FUD" going around the last weeks about this release)
The sound quality is actually good, though it's obviously not as good as a real TRUEHD track would be. I am, however, pleasantly surprised at the high video quality.
but WB released a TrueHD version of Superman Returns on BD. granted, the film already had a TrueHD track on HD DVD, but i really want Speed Racer to get 'redeemed' with a TrueHD track. it is my fav. movie of 2008 up there with Dark Knight.