I'm going to hazard a guess that it isn't going to be OGG, and I'm going to tender an explanation why sound files aren't compressed.
Compressed files take up less room and use less bandwidth when downloading, but they more than double in bulk when they're accessed. So if you have 5GB of compressed files, you may wind up needing 50GB once they're in use. If you don't have room for 25GB worth of game now, you really won't have room for the decompressed version. Plus there's playback to think about.
Compressed files must be decompressed before they can be played. Sure, modern technology is more than capable of decompressing files as they're played and or rendered (OGG files are compressed WAV files, BTW), but that requires a software overlay. Like every other software overlay (Fraps, Origin, what have you), it's going to add to the resource load. Most systems able to run the game can handle the additional resource load just fine, but some are going to whine and wheeze like a geriatric great-granduncle who is also a goat, and some may crash entirely. The game does not need more random crashes. And, to add insult to injury, the decompressed file is going to take up more precious RAM than the sound file would have if it weren't compressed in the first place, because - surprise! - when you decompress something, it gets bigger, and it doesn't delete the original file, so it's still there. Plus, you're going to need a system to go through and delete all those decompressed files after they're played, which becomes a potential memory leak, leading to steadily-increasing load times and steadily-decreasing system performance. Or, you know, they could just go with decompressed files to begin with, because systems buff enough to handle the decompression and post-play deletion of in situ audio/visual files will almost certainly have more than enough storage to handle the added bulk.
It's worth noting that uncompressed files require storage space. You need a bigger hard drive. Hard drives are cheap, and easy to upgrade. Compressed files require storage space, but they also require memory, RAM. RAM is cheap, too, relatively speaking, but it is not as easy to upgrade. Upgrading RAM isn't as difficult as climbing K2 (and you almost never need to apply for a permit from a foreign government to do it), but it is a hassle, and let's be honest. The first time you do it, you aren't going to check the supported memory list for your motherboard and you're going to buy the wrong thing. If you have my kind of luck, your motherboard is only going to support about five kinds of RAM, and you've already got the highest one installed. Upgrading storage is easy. Buy a hard drive, find a free slot, and plug it in. All done. I have no idea how it works if you've got a console instead of a PC, but I'm guessing that hard drive space is always going to be more plentiful than RAM.
Maybe the concern about file size is based on limited download bandwidth. OK, that's fair. Some parts of the world do place restrictions on data transfer, and 25GB may be outside some clients' monthly transfer allocation. If file compression can shave a few GB off that, it may even be worth the risk of file corruption that always accompanies the download of compressed archives. Just keep in mind that if the download is corrupted, you aren't going to get your bandwidth back if you have to download it again.
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