Let the hive mind of Engadget get that for you.
"What is the best wireless surround sound speaker solution? I have a home theater where running wires is just not feasible. I have my own speakers, so I don't want a system that has speakers with integrated wireless. I've done a far amount of research and have only come across a few companies that even offer a reasonable solution: KEF, Kenwood and Rocketfish. Is there anything else out there? What do you recommend? Thank you!"
This sounds like 22GB of uncompressed data. That's not uncommon for a game under development. If you were to compress the final product, I'm sure it'll consume less space. Until the product is released in final form, this really means nothing.
I'm sure they'll be some sort of compression because you don't want to load large chunks of uncompressed data off disc-- but maybe that's just me.