IGN reports that Four Swords will be playable in single-player for the first time in this new release, so you might want to add that important detail - I know a few people had trepidations about whether they'd be able to play it alone or not. IGN also mentioned it will be available for download from 28th September 2011 until 20th February 2012. Limited edition, but that's a decent window, and of course it's free.
Hooray! Never played this one, though I did play its successor on Gamecube.