The Nintendo DS has a long way to go before it can match the Xbox 360's online features and capabilities, but that doesn't mean we're any less jealous of the XBLA-only Puzzle Quest "1.5" add-on. In addition to a new story and arch-villain (Antharg, Lord of the Plague), the expansion pack will feature new spells, items, and quests. The upgrades we're extra envious about, though, are the new classes -- Bard, Rogue, Ranger, and Warlock.
Seeing as the DS edition of Puzzle Quest: Challenge of the Warlords doesn't allow for downloadable content, if the expansion pack were to come out for the DS, it would have to be on a new cart. We doubt D3 will bother with porting the game, but we're interested to find out if you'd buy a Puzzle Quest 1.5, provided that the game allowed you to migrate your old character, of course.
See also: GDC08: Hands almost-on with Puzzle Quest: Galactrix