Since nobody else is giving the announced sound feature any love (aside from Markus) I'll chime in and say that I can't wait for this
I'm a solo player and I like to play out all my games (sometimes even going pitch by pitch for those really important at-bats) so having sound in the game will just be another step towards getting immersed in my own little world.
Now, what about the "get Wife to understand obsession with OOTPB" feature?