^ A digipak is just one of the common types of CD packaging. Unlike the more common
jewel case, which is made entirely of plastic, a digipak is made of cardboard, with a (usually plastic) tray glued inside.
More information here. I'm not a big fan of digipaks myself, since the trays can't be replaced if the prongs that hold the CD in place get broken. Both LE-A and LE-B have digipaks, but it looks like LE-A might be larger than usual CD size.
From the information that I've seen, only LE-A comes with a booklet. I expect that all three versions will have some sort of
lyric booklet and that the LE-A booklet is a special photo booklet, but that's just my supposition. I haven't seen specifics about DVD content yet, but I would imagine that LE-A and LE-B have different DVDs, as well.