I don't doubt that all games will use uncompressed audio. 16 bit 44khz .wav format is more than good enough for video games, the CD standard, but it could be even higher resolution such as 48khz, 88.2 or 96khz. The PS3 is going to offer developers a lot of options because of the sheer power of the machine.
I expect that the GTHD delay indicates that the game is going to be released with more content on board, which would mean a higher than $5-10 US price. Undoubtedly, Sony took note of the empty game bellyaching, at least this is my guess.
How many of you would pay $19.99 for some included GT Classic content, say 100-200 cars and 20 tracks or so? Not to leave out the possibility of 60 GT5 level Premium cars and 3 or 4 tracks? Whatever form GTHD takes, I'm in.