I've been pestering everyone I know about this, as soon as we can find a dump of it we'll be able to determine a) if it can be ripped with current tools b) what to do with the audio.
The title screen still shows HAL Laboratory as copyright holders, so there might be a slimm chance of the HPS format used despite the developer being Game Arts (well, at least most of the team).
This has been uploaded more than three weeks ago. I doubt it's the real thing.
Give the game some time. There are people ripping it at the moment, of that I'm sure, but the ISO probably won't surface until a few days after the release - as it's always the case.
Yes, I'm very curious about this (and what he posted is one of the two bazillion fake torrents of SSBB). I keep hearing rumors of it being dual-layer, but I don't think I believe that since the modchips that support dual-layer discs (the burned kind), their support doesn't work reliably on some systems, so I'm kind of doubtful of there being any Wii games that are dual-layer.