What happens to files that are imported to MC from iT, duplicated into a file structure dedicated to MC, or does MC just create a db of the metadata and file locations?
It just makes a database.
It looks like ripping will put newly imported files into the MC folder structure. How can they be put into the iT folders, so they can be synced to iOS devices?
You can configure where the files are stored, and the filename structure. So you could just have it put the files where iTunes expects them (or in that weird "auto imported folder" thing they do. You can have MC's Auto-Import monitor any folders on your drive you want. So, you could just "follow iTunes's rules" (and let MC clean itself up with Auto-Import's "Fix Broken Links" option).
But...
I'd recommend you do NOT let iTunes automatically manage your file structure, though, as MC has much more powerful tools (once it is stable and ready, of course). Instead, move the files to a sane "shared" place not so buried on your hard drive. Maybe to
\Users\Shared\Music\ for example, or maybe on an external disk? In any case, you can turn the "automanagement" of files and folders off easily in iTunes in the Preferences under Advanced.
Uncheck
Keep iTunes Media Folder organized.
You can also move the files from right within the same spot. A good way to do it would be to "allow" iTunes to keep the files organized for long enough to move them, then once they're moved (which will cause iTunes to "fix" all of the old junk that hadn't been actually kept organized, which it does), you can untick that box to disable the auto-reorganizing feature.
Then...
Doug's AppleScripts for iTunesHe's got scripts for everything on there. Scripts for auto-importing files from folders, scripts for renaming things, controlling iTunes, syncing devices, and all sorts of scripts.
Keeping MC and iTunes in sync on a Mac may not prove that challenging at all. Auto-Import on the MC side, Doug's Scripts on the iTunes side. Maybe, just maybe, a little custom stuff from Glynor down the line too. Because that'll be fun to play with.
I don't know when, or if, this stuff will make it into the OSX version (of course), but... MC for Windows is
extremely scriptable. You can script all manner of crazy things, automate it, mine the database, and extract metadata via a REST-based web interface (XML).